This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages)
|World War I|
From the top, left to right:
and others ...
|Commanders and leaders|
|Main Allied leaders:||Main Central leaders:|
|Casualties and losses|
World War I (28 July 1914 – 11 November 1918), often abbreviated as WWI, was a global conflict fought between two coalitions, the Allied Powers and the Central Powers. Fighting took place throughout Europe, the Middle East, Africa, the Pacific, and parts of Asia.
The first decade of the 20th century saw increasing diplomatic tension between the European great powers. This reached a breaking point on 28 June 1914, when a Bosnian Serb named Gavrilo Princip assassinated Archduke Franz Ferdinand, heir to the Austro-Hungarian throne. Austria-Hungary held Serbia responsible, and declared war on 28 July. Russia came to Serbia's defence, and by 4 August, Germany, France and Britain were drawn into the war, with the Ottoman Empire joining in November the same year.
German strategy in 1914 was to first defeat France, then transfer forces to the Russian front. However, this failed, and by the end of 1914, the Western Front consisted of a continuous line of trenches stretching from the English Channel to Switzerland. The Eastern Front was more dynamic, but neither side could gain a decisive advantage, despite costly offensives. As the war expanded to more fronts, Bulgaria, Romania, Greece, Italy and others joined in from 1915 onward. In early 1917, the United States entered the war on the side of the Allies, and later the same year, the Bolsheviks seized power in the Russian October Revolution, making peace with the Central Powers in early 1918. Germany launched an offensive in the west in March 1918, but despite initial success, it left the German Army exhausted and demoralised. A successful Allied counter-offensive later that year caused a collapse of the German frontline. By the end of 1918, Bulgaria, the Ottoman Empire and Austria-Hungary agreed to armistices with the Allies, leaving Germany isolated. Facing revolution at home and with his army on the verge of mutiny, Kaiser Wilhelm II abdicated on 9 November. An armistice three days later ended the fighting, and the Paris Peace Conference imposed various settlements on the defeated powers, notably the Treaty of Versailles.
World War I was one of the deadliest wars in history, and resulted in an estimated 9 million soldiers dead and 23 million wounded, while 5 million civilians died due to military action, hunger and disease. Millions more died as a result of genocide, and the devastation of the war heavily contributed to the 1918 Spanish flu pandemic. The dissolution of the Russian, German, Austro-Hungarian, and Ottoman Empires resulted in the creation of new independent states, including Poland, Finland, Czechoslovakia, and Yugoslavia. The inability to manage post-war instability contributed to the outbreak of World War II in September 1939.
The term world war was first coined in September 1914 by German biologist and philosopher Ernst Haeckel. He claimed that "there is no doubt that the course and character of the feared 'European War' ... will become the first world war in the full sense of the word," in The Indianapolis Star on 20 September 1914.
The term First World War had been used by Lt-Col. Charles à Court Repington, as a title for his memoirs (published in 1920); he had noted his discussion on the matter with a Major Johnstone of Harvard University in his diary entry of 10 September 1918.
Prior to World War II, the events of 1914–1918 were generally known as the Great War or simply the World War. In August 1914, the magazine The Independent wrote "This is the Great War. It names itself". In October 1914, the Canadian magazine Maclean's similarly wrote, "Some wars name themselves. This is the Great War." Contemporary Europeans also referred to it as "the war to end war" and it was also described as "the war to end all wars" due to their perception of its unparalleled scale, devastation, and loss of life.
|Events leading to World War I|
Political and military alliances
For much of the 19th century, the major European powers maintained a tenuous
In order to isolate France and avoid a war on two fronts, Bismarck negotiated the League of the Three Emperors (German: Dreikaiserbund) between Austria-Hungary, Russia and Germany. After Russian victory in the 1877–1878 Russo-Turkish War, the League was dissolved due to Austrian concerns over Russian influence in the Balkans, an area they considered of vital strategic interest. Germany and Austria-Hungary then formed the 1879 Dual Alliance, which became the Triple Alliance when Italy joined in 1882. For Bismarck, the purpose of these agreements was to isolate France by ensuring the three Empires resolved any disputes between themselves; when this was threatened in 1880 by British and French attempts to negotiate directly with Russia, he reformed the League in 1881, which was renewed in 1883 and 1885. After the agreement lapsed in 1887, he replaced it with the Reinsurance Treaty, a secret agreement between Germany and Russia to remain neutral if either were attacked by France or Austria-Hungary.
Bismarck viewed peace with Russia as the foundation of German foreign policy but after becoming Kaiser in 1890, Wilhelm II forced him to retire and was persuaded not to renew the Reinsurance Treaty by his new Chancellor, Leo von Caprivi. This provided France an opportunity to counteract the Triple Alliance by signing the Franco-Russian Alliance in 1894, followed by the 1904 Entente Cordiale with Britain. The Triple Entente was completed by the 1907 Anglo-Russian Convention. While these were not formal alliances, by settling long-standing colonial disputes in Africa and Asia, the notion of British entry into any future conflict involving France or Russia became a possibility. British and Russian support for France against Germany during the Agadir Crisis in 1911 reinforced their relationship and increased Anglo-German estrangement, deepening the divisions that would erupt in 1914.
German industrial strength and production significantly increased after 1871, driven by the creation of a unified Reich,
However, it was also an emotional decision, driven by Wilhelm's simultaneous admiration for the Royal Navy and desire to outdo and surpass it. Bismarck thought that the British would not interfere in Europe, so long as its maritime supremacy remained secure, but his dismissal in 1890 led to a change in policy and an Anglo-German naval arms race began. Despite the vast sums spent by Tirpitz, the launch of HMS Dreadnought in 1906 gave the British a technological advantage over their German rivals which they never lost. Ultimately, the race diverted huge resources into creating a German navy large enough to antagonise Britain, but not defeat it; in 1911, Chancellor Theobald von Bethmann Hollweg acknowledged defeat, leading to the Rüstungswende or 'armaments turning point', when he switched expenditure from the navy to the army.
This decision was not driven by a reduction in political tensions, but German concern over Russia's quick recovery from its defeat in the
Conflicts in the Balkans
The years before 1914 were marked by a series of crises in the Balkans as other powers sought to benefit from Ottoman decline. While Pan-Slavic and Orthodox Russia considered itself the protector of Serbia and other Slav states, they preferred the strategically vital Bosporus straits to be controlled by a weak Ottoman government, rather than an ambitious Slav power like Bulgaria. Since Russia had its own ambitions in northeastern Anatolia and their clients had over-lapping claims in the Balkans, balancing these divided Russian policy-makers and added to regional instability.
Austrian statesmen viewed the Balkans as essential for the continued existence of their Empire, and saw Serbian expansion as a direct threat. The 1908–1909
Tensions increased after the 1911–1912 Italo-Turkish War demonstrated Ottoman weakness and led to the formation of the Balkan League, an alliance of Serbia, Bulgaria, Montenegro, and Greece. The League quickly overran most of the Ottomans' territory in the Balkans during the 1912–1913 First Balkan War, much to the surprise of outside observers. The Serbian capture of ports on the Adriatic resulted in partial Austrian mobilisation starting on 21 November 1912, including units along the Russian border in Galicia. In a meeting the next day, the Russian government decided not to mobilise in response, unwilling to precipitate a war for which they were not as of yet prepared to handle.
The Great Powers sought to re-assert control through the 1913 Treaty of London, which created an independent Albania, while enlarging the territories of Bulgaria, Serbia, Montenegro and Greece. However, disputes between the victors sparked the 33-day Second Balkan War, when Bulgaria attacked Serbia and Greece on 16 June 1913; it was defeated, losing most of Macedonia to Serbia and Greece, and Southern Dobruja to Romania. The result was that even countries which benefited from the Balkan Wars, such as Serbia and Greece, felt cheated of their "rightful gains", while for Austria it demonstrated the apparent indifference with which other powers viewed their concerns, including Germany. This complex mix of resentment, nationalism and insecurity helps explain why the pre-1914 Balkans became known as the "powder keg of Europe".
On 28 June 1914, Archduke Franz Ferdinand of Austria, heir presumptive to Emperor Franz Joseph, visited Sarajevo, capital of the recently annexed provinces of Bosnia and Herzegovina. Six assassins[l] from the movement known as Young Bosnia, or Mlada Bosna, took up positions along the route taken by the Archduke's motorcade, with the intention of assassinating him. Supplied with arms by extremists within the Serbian Black Hand intelligence organisation, they hoped his death would free Bosnia from Austrian rule, although there was little agreement on what would replace it.
Nedeljko Čabrinović threw a grenade at the Archduke's car and injured two of his aides, who were taken to hospital while the convoy carried on. The other assassins were also unsuccessful but an hour later, as Ferdinand was returning from visiting the injured officers, his car took a wrong turn into a street where Gavrilo Princip was standing. He stepped forward and fired two pistol shots, fatally wounding Ferdinand and his wife Sophie, who both died shortly thereafter. Although Emperor Franz Joseph was shocked by the incident, political and personal differences meant the two men were not close; allegedly, his first reported comment was "A higher power has re-established the order which I, alas, could not preserve".
According to historian Zbyněk Zeman, his reaction was reflected more broadly in Vienna, where "the event almost failed to make any impression whatsoever. On 28 and 29 June, the crowds listened to music and drank wine, as if nothing had happened." Nevertheless, the impact of the murder of the heir to the throne was significant, and has been described by historian Christopher Clark as a "9/11 effect, a terrorist event charged with historic meaning, transforming the political chemistry in Vienna".
Expansion of violence in Bosnia and Herzegovina
The Austro-Hungarian authorities encouraged the subsequent anti-Serb riots in Sarajevo, in which Bosnian Croats and Bosniaks killed two Bosnian Serbs and damaged numerous Serb-owned buildings. Violent actions against ethnic Serbs were also organised outside Sarajevo, in other cities in Austro-Hungarian-controlled Bosnia and Herzegovina, Croatia and Slovenia. Austro-Hungarian authorities in Bosnia and Herzegovina imprisoned and extradited approximately 5,500 prominent Serbs, 700 to 2,200 of whom died in prison. A further 460 Serbs were sentenced to death. A predominantly Bosniak special militia known as the Schutzkorps was established and carried out the persecution of Serbs.
The assassination initiated the
Serbia ordered general mobilisation on 25 July, but accepted all the terms, except for those empowering Austrian representatives to suppress "subversive elements" inside Serbia, and take part in the investigation and trial of Serbians linked to the assassination. Claiming this amounted to rejection, Austria broke off diplomatic relations and ordered partial mobilisation the next day; on 28 July, they declared war on Serbia and began shelling Belgrade. Having initiated war preparations on 25 July, Russia now ordered general mobilisation in support of Serbia on 30th.
Anxious to ensure backing from the SPD political opposition by presenting Russia as the aggressor, German Chancellor Bethmann Hollweg delayed commencement of war preparations until 31 July. That afternoon the Russian government were handed a note requiring them to "cease all war measures against Germany and Austria-Hungary" within 12 hours. A further German demand for neutrality was refused by the French who ordered general mobilisation but delayed declaring war. The German General Staff had long assumed they faced a war on two fronts; the Schlieffen Plan envisaged using 80% of the army to defeat France in the west, then switch to Russia. Since this required them to move quickly, mobilisation orders were issued that afternoon.
At a meeting on 29 July, the British cabinet had narrowly decided its obligations to Belgium under the 1839 Treaty of London did not require it to oppose a German invasion with military force. However, this was largely driven by Prime Minister Asquith's desire to maintain unity; he and his senior Cabinet ministers were already committed to support France, the Royal Navy had been mobilised and public opinion was strongly in favour of intervention. On 31 July, Britain sent notes to Germany and France, asking them to respect Belgian neutrality; France pledged to do so, Germany did not reply.
Once the German ultimatum to Russia expired on the morning of 1 August, the two countries were at war. Later the same day, Wilhelm was informed by his ambassador in London, Prince Lichnowsky, that Britain would remain neutral if France was not attacked, and might not intervene at all given the ongoing Home Rule Crisis in Ireland. Jubilant at this news, he ordered General Moltke, the German chief of staff, to "march the whole of the ... army to the East". This allegedly brought Moltke to the verge of a nervous breakdown, who protested that "it cannot be done. The deployment of millions cannot be improvised." Lichnowsky soon realised he was mistaken, although Wilhelm insisted on waiting for a telegram from his cousin George V; once received it confirmed there had been a misunderstanding, and he told Moltke, "Now do what you want."
Aware of German plans to attack through Belgium, French Commander-in-Chief Joseph Joffre asked his government for permission to cross the border and pre-empt such a move. To avoid a violation of Belgian neutrality, he was told any advance could come only after a German invasion. On 2 August, Germany occupied Luxembourg and exchanged fire with French units; on 3 August, they declared war on France and demanded free passage across Belgium, which was refused. Early on the morning of 4 August, the Germans invaded and Albert I of Belgium called for assistance under the Treaty of London. Britain sent Germany an ultimatum demanding they withdraw from Belgium; when this expired at midnight without a response, the two empires were at war.
Progress of the war
Confusion among the Central Powers
The strategy of the Central Powers suffered from miscommunication. Germany had promised to support Austria-Hungary's invasion of Serbia, but interpretations of what this meant differed. Previously tested deployment plans had been replaced early in 1914, but those had never been tested in exercises. Austro-Hungarian leaders believed Germany would cover its northern flank against Russia. Germany, however, envisioned Austria-Hungary directing most of its troops against Russia, while Germany dealt with France. This confusion forced the Austro-Hungarian Army to divide its forces between the Russian and Serbian fronts.
Beginning on 12 August, the Austrian and Serbs clashed at the battles of the Cer and Kolubara; over the next two weeks, Austrian attacks were repulsed with heavy losses, dashing their hopes of a swift victory and marking the first major Allied victories of the war. As a result, Austria had to keep sizeable forces on the Serbian front, weakening its efforts against Russia. Serbia's defeat of the 1914 invasion has been called one of the major upset victories of the twentieth century. In spring 1915, the campaign saw the first use of anti-aircraft warfare after an Austrian plane was shot down with ground-to-air fire, as well as the first medical evacuation by the Serbian army in autumn 1915.
German offensive in Belgium and France
Upon mobilisation in 1914, 80% of the German Army was located on the Western Front, with the remainder acting as a screening force in the East; officially titled Aufmarsch II West, it is better known as the Schlieffen Plan after its creator, Alfred von Schlieffen, head of the German General Staff from 1891 to 1906. Rather than a direct attack across their shared frontier, the German right wing would sweep through the Netherlands and Belgium, then swing south, encircling Paris and trapping the French army against the Swiss border. Schlieffen estimated this would take six weeks, after which the German army would transfer to the East and defeat the Russians.
The plan was substantially modified by his successor,
The initial German advance in the West was very successful and by the end of August the Allied left, which included the British Expeditionary Force (BEF), was in full retreat. At the same time, the French offensive in Alsace-Lorraine was a disastrous failure, with casualties exceeding 260,000, including 27,000 killed on 22 August during the Battle of the Frontiers. German planning provided broad strategic instructions, while allowing army commanders considerable freedom in carrying them out at the front; this worked well in 1866 and 1870 but in 1914, von Kluck used this freedom to disobey orders, opening a gap between the German armies as they closed on Paris. The French and British exploited this gap to halt the German advance east of Paris at the First Battle of the Marne from 5 to 12 September and push the German forces back some 50 km (31 mi).
In 1911, the Russian Stavka had agreed with the French to attack Germany within fifteen days of mobilisation, ten days before the Germans had anticipated, although it meant the two Russian armies that entered East Prussia on 17 August did so without many of their support elements. Although the Russian Second Army was effectively destroyed at the Battle of Tannenberg on 26–30 August, their advance caused the Germans to re-route their 8th Field Army from France to East Prussia, a factor in Allied victory on the Marne.
By the end of 1914, German troops held strong defensive positions inside France, controlled the bulk of France's domestic coalfields and had inflicted 230,000 more casualties than it lost itself. However, communications problems and questionable command decisions cost Germany the chance of a decisive outcome, while it had failed to achieve the primary objective of avoiding a long, two-front war. As was apparent to a number of German leaders, this amounted to a strategic defeat; shortly after the Marne, Crown Prince Wilhelm told an American reporter; "We have lost the war. It will go on for a long time but lost it is already."
Asia and the Pacific
On 30 August 1914, New Zealand occupied German Samoa, now the independent state of Samoa. On 11 September, the Australian Naval and Military Expeditionary Force landed on the island of New Britain, then part of German New Guinea. On 28 October, the German cruiser SMS Emden sank the Russian cruiser Zhemchug in the Battle of Penang. Japan declared war on Germany prior to seizing territories in the Pacific which later became the South Seas Mandate, as well as German Treaty ports on the Chinese Shandong peninsula at Tsingtao. After Vienna refused to withdraw its cruiser SMS Kaiserin Elisabeth from Tsingtao, Japan declared war on Austria-Hungary as well, and the ship was sunk at Tsingtao in November 1914. Within a few months, Allied forces had seized all German territories in the Pacific, leaving only isolated commerce raiders and a few holdouts in New Guinea.
Some of the first clashes of the war involved British, French, and German colonial forces in Africa. On 6–7 August, French and British troops invaded the German protectorate of Togoland and Kamerun. On 10 August, German forces in South-West Africa attacked South Africa; sporadic and fierce fighting continued for the rest of the war. The German colonial forces in German East Africa, led by Colonel Paul von Lettow-Vorbeck, fought a guerrilla warfare campaign during World War I and only surrendered two weeks after the armistice took effect in Europe.
Indian support for the Allies
Prior to the war, Germany had attempted to use Indian nationalism and pan-Islamism to its advantage, a policy continued post-1914 by instigating uprisings in India, while the Niedermayer–Hentig Expedition urged Afghanistan to join the war on the side of Central Powers. However, contrary to British fears of a revolt in India, the outbreak of the war saw a reduction in nationalist activity. This was largely because leaders from the Indian National Congress and other groups believed support for the British war effort would hasten Indian Home Rule, a promise allegedly made explicit in 1917 by Edwin Montagu, then Secretary of State for India.
In 1914, the British Indian Army was larger than the British Army itself, and between 1914 and 1918 an estimated 1.3 million Indian soldiers and labourers served in Europe, Africa, and the Middle East, while the Government of India and their princely allies supplied large quantities of food, money, and ammunition. In all, 140,000 soldiers served on the Western Front and nearly 700,000 in the Middle East, with 47,746 killed and 65,126 wounded.
The suffering engendered by the war, as well as the failure of the British government to grant self-government to India after the end of hostilities, bred disillusionment and resulted in the campaign for full independence led by Mahatma Gandhi.
Western Front 1914 to 1916
Trench warfare begins
Pre-war military tactics that emphasised open warfare and the individual rifleman proved obsolete when confronted with conditions prevailing in 1914. Technological advances allowed the creation of strong defensive systems largely impervious to massed infantry advances, such as barbed wire, machine guns and above all far more powerful artillery, which dominated the battlefield and made crossing open ground extremely difficult. Both sides struggled to develop tactics for breaching entrenched positions without suffering heavy casualties. In time, however, technology enabled the production of new offensive weapons, such as gas warfare and the tank.
After the First Battle of the Marne in September 1914, Allied and German forces unsuccessfully tried to outflank each other, a series of manoeuvres later known as the "Race to the Sea". By the end of 1914, the opposing forces confronted each other along an uninterrupted line of entrenched positions from the Channel to the Swiss border. Since the Germans were normally able to choose where to stand, they generally held the high ground, while their trenches tended to be better built; those constructed by the French and English were initially considered "temporary", only needed until an offensive would smash the German defences. Both sides tried to break the stalemate using scientific and technological advances. On 22 April 1915, at the Second Battle of Ypres, the Germans (violating the Hague Convention) used chlorine gas for the first time on the Western Front. Several types of gas soon became widely used by both sides, and though it never proved a decisive, battle-winning weapon, it became one of the most-feared and best-remembered horrors of the war.
Continuation of trench warfare
Neither side proved able to deliver a decisive blow for the next two years. Throughout 1915–17, the British Empire and France suffered more casualties than Germany, because of both the strategic and tactical stances chosen by the sides. Strategically, while the Germans mounted only one major offensive, the Allies made several attempts to break through the German lines.
In February 1916 the Germans attacked French defensive positions at the Battle of Verdun, lasting until December 1916. The Germans made initial gains, before French counter-attacks returned matters to near their starting point. Casualties were greater for the French, but the Germans bled heavily as well, with anywhere from 700,000 to 975,000 casualties suffered between the two combatants. Verdun became a symbol of French determination and self-sacrifice.
The Battle of the Somme was an Anglo-French offensive of July to November 1916. The opening day on 1 July 1916 was the bloodiest single day in the history of the British Army, which suffered 57,470 casualties, including 19,240 dead. As a whole, the Somme offensive led to an estimated 420,000 British casualties, along with 200,000 French and 500,000 German. Gun fire was not the only factor taking lives; the diseases that emerged in the trenches were a major killer on both sides. The living conditions made it so that countless diseases and infections occurred, such as trench foot, shell shock, blindness/burns from mustard gas, lice, trench fever, "cooties" (body lice) and the 'Spanish flu'.[unreliable source?]
At the start of the war, German cruisers were scattered across the globe, some of which were subsequently used to attack Allied merchant shipping. The British Royal Navy systematically hunted them down, though not without some embarrassment from its inability to protect Allied shipping. For example, the light cruiser SMS Emden, which was part of the German East Asia Squadron stationed at Qingdao, seized or sank 15 merchantmen, as well as a Russian cruiser and a French destroyer. Most of the squadron was returning to Germany when it sank two British armoured cruisers at the Battle of Coronel in November 1914, before being virtually destroyed at the Battle of the Falkland Islands in December. The SMS Dresden escaped with a few auxiliaries, but after the Battle of Más a Tierra, these too had either been destroyed or interned.
Soon after the outbreak of hostilities, Britain began a naval blockade of Germany. The strategy proved effective, cutting off vital military and civilian supplies, although this blockade violated accepted international law codified by several international agreements of the past two centuries. Britain mined international waters to prevent any ships from entering entire sections of ocean, causing danger to even neutral ships. Since there was limited response to this tactic of the British, Germany expected a similar response to its unrestricted submarine warfare.
The Battle of Jutland (German: Skagerrakschlacht, or "Battle of the Skagerrak") in May/June 1916 developed into the largest naval battle of the war. It was the only full-scale clash of battleships during the war, and one of the largest in history. The Kaiserliche Marine's High Seas Fleet, commanded by Vice Admiral Reinhard Scheer, fought the Royal Navy's Grand Fleet, led by Admiral Sir John Jellicoe. The engagement was a stand off, as the Germans were outmanoeuvred by the larger British fleet, but managed to escape and inflicted more damage to the British fleet than they received. Strategically, however, the British asserted their control of the sea, and the bulk of the German surface fleet remained confined to port for the duration of the war.
German U-boats attempted to cut the supply lines between North America and Britain. The nature of submarine warfare meant that attacks often came without warning, giving the crews of the merchant ships little hope of survival. The United States launched a protest, and Germany changed its rules of engagement. After the sinking of the passenger ship RMS Lusitania in 1915, Germany promised not to target passenger liners, while Britain armed its merchant ships, placing them beyond the protection of the "cruiser rules", which demanded warning and movement of crews to "a place of safety" (a standard that lifeboats did not meet). Finally, in early 1917, Germany adopted a policy of unrestricted submarine warfare, realising the Americans would eventually enter the war. Germany sought to strangle Allied sea lanes before the United States could transport a large army overseas, but after initial successes eventually failed to do so.
The U-boat threat lessened in 1917, when merchant ships began travelling in convoys, escorted by destroyers. This tactic made it difficult for U-boats to find targets, which significantly lessened losses; after the hydrophone and depth charges were introduced, accompanying destroyers could attack a submerged submarine with some hope of success. Convoys slowed the flow of supplies since ships had to wait as convoys were assembled. The solution to the delays was an extensive program of building new freighters. Troopships were too fast for the submarines and did not travel the North Atlantic in convoys. The U-boats had sunk more than 5,000 Allied ships, at a cost of 199 submarines.
World War I also saw the first use of aircraft carriers in combat, with HMS Furious launching Sopwith Camels in a successful raid against the Zeppelin hangars at Tondern in July 1918, as well as blimps for antisubmarine patrol.
War in the Balkans
Faced with Russia in the east, Austria-Hungary could spare only one-third of its army to attack Serbia. After suffering heavy losses, the Austrians briefly occupied the Serbian capital, Belgrade. A Serbian counter-attack in the Battle of Kolubara succeeded in driving them from the country by the end of 1914. For the first ten months of 1915, Austria-Hungary used most of its military reserves to fight Italy. German and Austro-Hungarian diplomats, however, scored a coup by persuading Bulgaria to join the attack on Serbia. The Austro-Hungarian provinces of Slovenia, Croatia and Bosnia provided troops for Austria-Hungary in the fight with Serbia, Russia and Italy. Montenegro allied itself with Serbia.
Bulgaria declared war on Serbia on 14 October 1915 and joined in the attack by the Austro-Hungarian army under Mackensen's army of 250,000 that was already underway. Serbia was conquered in a little more than a month, as the Central Powers, now including Bulgaria, sent in 600,000 troops total. The Serbian army, fighting on two fronts and facing certain defeat, retreated into northern Albania. The Serbs suffered defeat in the Battle of Kosovo. Montenegro covered the Serbian retreat towards the Adriatic coast in the Battle of Mojkovac in 6–7 January 1916, but ultimately the Austrians also conquered Montenegro. The surviving Serbian soldiers were evacuated by ship to Greece. After conquest, Serbia was divided between Austro-Hungary and Bulgaria.
In late 1915, a Franco-British force landed at Salonica in Greece to offer assistance and to pressure its government to declare war against the Central Powers. However, the pro-German King Constantine I dismissed the pro-Allied government of Eleftherios Venizelos before the Allied expeditionary force arrived. The friction between the King of Greece and the Allies continued to accumulate with the National Schism, which effectively divided Greece between regions still loyal to the king and the new provisional government of Venizelos in Salonica. After intense negotiations and an armed confrontation in Athens between Allied and royalist forces (an incident known as Noemvriana), the King of Greece abdicated and his second son Alexander took his place; Greece officially joined the war on the side of the Allies in June 1917.
The Macedonian front was initially mostly static. French and Serbian forces retook limited areas of Macedonia by recapturing Bitola on 19 November 1916 following the costly Monastir offensive, which brought stabilisation of the front.
Serbian and French troops finally made a breakthrough in September 1918 in the Vardar offensive, after most of the German and Austro-Hungarian troops had been withdrawn. The Bulgarians were defeated at the Battle of Dobro Pole, and by 25 September British and French troops had crossed the border into Bulgaria proper as the Bulgarian army collapsed. Bulgaria capitulated four days later, on 29 September 1918. The German high command responded by despatching troops to hold the line, but these forces were far too weak to re-establish a front.
The disappearance of the Macedonian front meant that the road to Budapest and Vienna was now opened to Allied forces. Hindenburg and Ludendorff concluded that the strategic and operational balance had now shifted decidedly against the Central Powers and, a day after the Bulgarian collapse, insisted on an immediate peace settlement.
The Ottomans threatened Russia's Caucasian territories and Britain's communications with India via the Suez Canal. As the conflict progressed, the Ottoman Empire took advantage of the European powers' preoccupation with the war and conducted large-scale ethnic cleansing of the indigenous Armenian, Greek, and Assyrian Christian populations, known as the Armenian genocide, Greek genocide, and Sayfo respectively.
The British and French opened overseas fronts with the Gallipoli (1915) and Mesopotamian campaigns (1914). In Gallipoli, the Ottoman Empire successfully repelled the British, French, and Australian and New Zealand Army Corps (ANZACs). In Mesopotamia, by contrast, after the defeat of the British defenders in the siege of Kut by the Ottomans (1915–16), British Imperial forces reorganised and captured Baghdad in March 1917. The British were aided in Mesopotamia by local Arab and Assyrian fighters, while the Ottomans employed local Kurdish and Turcoman tribes.
Further to the west, the Suez Canal was defended from Ottoman attacks in 1915 and 1916; in August, a German and Ottoman force was defeated at the Battle of Romani by the ANZAC Mounted Division and the 52nd (Lowland) Infantry Division. Following this victory, an Egyptian Expeditionary Force advanced across the Sinai Peninsula, pushing Ottoman forces back in the Battle of Magdhaba in December and the Battle of Rafa on the border between the Egyptian Sinai and Ottoman Palestine in January 1917.
Russian armies generally had success in the Caucasus campaign. Enver Pasha, supreme commander of the Ottoman armed forces, was ambitious and dreamed of re-conquering central Asia and areas that had been lost to Russia previously. He was, however, a poor commander. He launched an offensive against the Russians in the Caucasus in December 1914 with 100,000 troops, insisting on a frontal attack against mountainous Russian positions in winter. He lost 86% of his force at the Battle of Sarikamish.
The Ottoman Empire, with German support, invaded Persia (modern Iran) in December 1914 in an effort to cut off British and Russian access to petroleum reservoirs around Baku near the Caspian Sea. Persia, ostensibly neutral, had long been under the spheres of British and Russian influence. The Ottomans and Germans were aided by Kurdish and Azeri forces, together with a large number of major Iranian tribes, such as the Qashqai, Tangistanis, Lurs, and Khamseh, while the Russians and British had the support of Armenian and Assyrian forces. The Persian campaign was to last until 1918 and end in failure for the Ottomans and their allies. However, the Russian withdrawal from the war in 1917 led to Armenian and Assyrian forces, who had hitherto inflicted a series of defeats upon the forces of the Ottomans and their allies, being cut off from supply lines, outnumbered, outgunned and isolated, forcing them to fight and flee towards British lines in northern Mesopotamia.
General Yudenich, the Russian commander from 1915 to 1916, drove the Turks out of most of the southern Caucasus with a string of victories. During the 1916 campaign, the Russians defeated the Turks in the Erzurum offensive, also occupying Trabzon. In 1917, Russian Grand Duke Nicholas assumed command of the Caucasus front. Nicholas planned a railway from Russian Georgia to the conquered territories so that fresh supplies could be brought up for a new offensive in 1917. However, in March 1917 (February in the pre-revolutionary Russian calendar), the Tsar abdicated in the course of the February Revolution, and the Russian Caucasus Army began to fall apart.
Total Allied casualties on the Ottoman fronts amounted 650,000 men. Total Ottoman casualties were 725,000, with 325,000 dead and 400,000 wounded.
Although Italy joined the Triple Alliance in 1882, a treaty with its traditional Austrian enemy was so controversial that subsequent governments denied its existence and the terms were only made public in 1915. This arose from nationalist designs on Austro-Hungarian territory in Trentino, the Austrian Littoral, Rijeka and Dalmatia, which were considered vital to secure the borders established in 1866. In 1902, Rome secretly agreed with France to remain neutral if the latter was attacked by Germany, effectively nullifying its role in the Triple Alliance.
When the war began in 1914, Italy argued the Triple Alliance was defensive in nature and it was not obliged to support an Austrian attack on Serbia. Opposition to joining the Central Powers increased when Turkey became a member in September, since in 1911 Italy had occupied Ottoman possessions in Libya and the Dodecanese islands. To secure Italian neutrality, the Central Powers offered them the French protectorate of Tunisia, while in return for an immediate entry into the war, the Allies agreed to their demands for Austrian territory and sovereignty over the Dodecanese. Although they remained secret, these provisions were incorporated into the April 1915 Treaty of London; Italy joined the Triple Entente and on 23 May declared war on Austria-Hungary, followed by Germany fifteen months later.
The pre-1914 Italian army was the weakest in Europe, short of officers, trained men, adequate transport and modern weapons; by April 1915, some of these deficiencies had been remedied but it was still unprepared for the major offensive required by the Treaty of London. The advantage of superior numbers was offset by the difficult terrain; much of the fighting took place at altitudes of over 3000 metres in the Alps and Dolomites, where trench lines had to be cut through rock and ice and keeping troops supplied was a major challenge. These issues were exacerbated by unimaginative strategies and tactics. Between 1915 and 1917, the Italian commander, Luigi Cadorna, undertook a series of frontal assaults along the Isonzo which made little progress and cost many lives; by the end of the war, total Italian combat deaths totalled around 548,000.
In the spring of 1916, the Austro-Hungarians counterattacked in
Despite secretly agreeing to support the Triple Alliance in 1883, Romania increasingly found itself at odds with the Central Powers over their support for Bulgaria in the 1912 to 1913 Balkan Wars and the status of ethnic Romanian communities in Hungarian-controlled Transylvania, which comprised an estimated 2.8 million of the 5.0 million population. With the ruling elite split into pro-German and pro-Entente factions, Romania remained neutral in 1914, arguing like Italy that because Austria-Hungary had declared war on Serbia, it was under no obligation to join them. They maintained this position for the next two years, while allowing Germany and Austria to transport military supplies and advisors across Romanian territory.
In September 1914, Russia had acknowledged Romanian rights to Austro-Hungarian territories including Transylvania and Banat, whose acquisition had widespread popular support,  and Russian success against Austria led Romania to join the Entente in the August 1916 Treaty of Bucharest. Under the strategic plan known as Hypothesis Z, the Romanian army planned an offensive into Transylvania, while defending Southern Dobruja and Giurgiu against a possible Bulgarian counterattack. On 27 August 1916, they attacked Transylvania and occupied substantial parts of the province before being driven back by the recently formed German 9th Army, led by former Chief of Staff Falkenhayn. A combined German-Bulgarian-Turkish offensive captured Dobruja and Giurgiu, although the bulk of the Romanian army managed to escape encirclement and retreated to Bucharest, which surrendered to the Central Powers on 6 December 1916.
On 7 May 1918 Romania signed the Treaty of Bucharest with the Central Powers, which recognised Romanian sovereignty over Bessarabia in return for ceding control of passes in the Carpathian Mountains to Austria-Hungary and granting oil concessions to Germany. Although approved by Parliament, Ferdinand I refused to sign the treaty, hoping for an Allied victory; Romania re-entered the war on 10 November 1918 on the side of the Allies and the Treaty of Bucharest was formally annulled by the Armistice of 11 November 1918.[m] Between 1914 and 1918, an estimated 400,000 to 600,000 ethnic Romanians served with the Austro-Hungarian army, of whom up to 150,000 were killed in action; total military and civilian deaths within contemporary Romanian borders are estimated at 748,000.
As previously agreed with France, Russian plans at the start of the war were to simultaneously advance into Austrian Galicia and East Prussia as soon as possible. Although their attack on Galicia was largely successful, and the invasions achieved their aim of forcing Germany to divert troops from the Western Front, the speed of mobilisation meant they did so without much of their heavy equipment and support functions. These weaknesses contributed to Russian defeats at Tannenberg and the Masurian Lakes in August and September 1914, forcing them to withdraw from East Prussia with heavy losses. By spring 1915, they had also retreated from Galicia, and the May 1915 Gorlice–Tarnów offensive then allowed the Central Powers to invade Russian-occupied Poland. On 5 August, the loss of Warsaw forced the Russians to abandon their Polish territories.
Despite the successful June 1916 Brusilov offensive against the Austrians in eastern Galicia, shortages of supplies, heavy losses and command failures prevented the Russians from fully exploiting their victory. However, it was one of the most significant and impactful offensives of the war, diverting German resources from Verdun, relieving Austro-Hungarian pressure on the Italians, and convincing Romania to enter the war on the side of the Allies on 27 August. It also fatally weakened both the Austrian and Russian armies, whose offensive capabilities were badly affected by their losses and increased the disillusionment with the war that ultimately led to the Russian revolutions.
Meanwhile, unrest grew in Russia as the Tsar remained at the front, with the home front controlled by Empress Alexandra. Her increasingly incompetent rule and food shortages in urban areas led to widespread protests and the murder of her favourite, Grigori Rasputin, at the end of 1916.
Central Powers peace overtures
On 12 December 1916, after ten brutal months of the Battle of Verdun and a successful offensive against Romania, Germany attempted to negotiate a peace with the Allies. However, this attempt was rejected out of hand as a "duplicitous war ruse".
Soon after, US president Woodrow Wilson attempted to intervene as a peacemaker, asking in a note for both sides to state their demands and start negotiations. Lloyd George's War Cabinet considered the German offer to be a ploy to create divisions amongst the Allies. After initial outrage and much deliberation, they took Wilson's note as a separate effort, signalling that the United States was on the verge of entering the war against Germany following the "submarine outrages". While the Allies debated a response to Wilson's offer, the Germans chose to rebuff it in favour of "a direct exchange of views". Learning of the German response, the Allied governments were free to make clear demands in their response of 14 January. They sought restoration of damages, the evacuation of occupied territories, reparations for France, Russia and Romania, and a recognition of the principle of nationalities. This included the liberation of Italians, Slavs, Romanians, Czecho-Slovaks, and the creation of a "free and united Poland". On the question of security, the Allies sought guarantees that would prevent or limit future wars, complete with sanctions, as a condition of any peace settlement. The negotiations failed and the Entente powers rejected the German offer on the grounds that Germany had not put forward any specific proposals.
Final years of the war
Russian Revolution and withdrawal
By the end of 1916, Russian casualties totalled nearly five million killed, wounded or captured, with major urban areas affected by food shortages and high prices. In March 1917, Tsar Nicholas ordered the military to forcibly suppress a wave of strikes in Petrograd but the troops refused to fire on the crowds. Revolutionaries set up the Petrograd Soviet and fearing a left-wing takeover, the State Duma forced Nicholas to abdicate and established the Russian Provisional Government, which confirmed Russia's willingness to continue the war. However, the Petrograd Soviet refused to disband, creating competing power centres and caused confusion and chaos, with frontline soldiers becoming increasingly demoralised and unwilling to fight on.
Following the Tsar's abdication, Vladimir Lenin—with the help of the German government—was ushered by train from Switzerland into Russia on 16 April 1917. Discontent and the weaknesses of the Provisional Government led to a rise in the popularity of the Bolshevik Party, led by Lenin, which demanded an immediate end to the war. The Revolution of November was followed in December by an armistice and negotiations with Germany. At first, the Bolsheviks refused the German terms, but when German troops began marching across Ukraine unopposed, the new government acceded to the Treaty of Brest-Litovsk on 3 March 1918. The treaty ceded vast territories, including Finland, Estonia, Latvia, Lithuania, parts of Poland and Ukraine to the Central Powers.
With the Russian Empire out of the war, Romania found itself alone on the Eastern Front and signed the Treaty of Bucharest with the Central Powers in May 1918, ending the state of war between Romania and the Central Powers. Under the terms of the treaty, Romania had to give territory to Austria-Hungary and Bulgaria, and lease its oil reserves to Germany. However, the terms also included the Central Powers recognition of the union of Bessarabia with Romania.
United States enters the war
The United States was a major supplier of war materiel to the Allies but remained neutral in 1914, in large part due to domestic opposition. The most significant factor in creating the support Wilson needed was the German submarine offensive, which not only cost American lives, but paralysed trade as ships were reluctant to put to sea.
On 6 April 1917, Congress declared war on Germany as an "Associated Power" of the Allies. The United States Navy sent a battleship group to Scapa Flow to join the Grand Fleet and provided convoy escorts. In April 1917, the United States Army had fewer than 300,000 men, including National Guard units, compared to British and French armies of 4.1 and 8.3 million respectively. The Selective Service Act of 1917 drafted 2.8 million men, although training and equipping such numbers was a huge logistical challenge. By June 1918, over 667,000 members of the American Expeditionary Forces (AEF), had been transported to France, a figure which reached 2 million by the end of November.
Despite his conviction Germany must be defeated, Wilson went to war to ensure the US played a leading role in shaping the peace, which meant preserving the AEF as a separate military force, rather than being absorbed into British or French units as his Allies wanted. He was strongly supported by AEF commander General John J. Pershing, a proponent of pre-1914 "open warfare" who considered the French and British emphasis on artillery as misguided and incompatible with American "offensive spirit". Much to the frustration of his Allies, who had suffered heavy losses in 1917, he insisted on retaining control of American troops and refused to commit them to the front line until able to operate as independent units. As a result, the first significant US involvement was the Meuse–Argonne offensive in late September 1918.
Nivelle Offensive (April–May 1917)
In December 1916, Robert Nivelle replaced Pétain as commander of French armies on the Western Front and began planning a spring attack in Champagne, part of a joint Franco-British operation. Nivelle claimed the capture of his main objective, the Chemin des Dames, would achieve a massive breakthrough and cost no more than 15,000 casualties. Poor security meant German intelligence was well informed on tactics and timetables, but despite this, when the attack began on 16 April the French made substantial gains, before being brought to a halt by the newly built and extremely strong defences of the Hindenburg Line. Nivelle persisted with frontal assaults and by 25 April the French had suffered nearly 135,000 casualties, including 30,000 dead, most incurred in the first two days.
Concurrent British attacks at Arras were more successful, although ultimately of little strategic value. Operating as a separate unit for the first time, the Canadian Corps capture of Vimy Ridge during the battle is viewed by many Canadians as a defining moment in creating a sense of national identity. Although Nivelle continued the offensive, on 3 May the 21st Division, which had been involved in some of the heaviest fighting at Verdun, refused orders to go into battle, initiating the French Army mutinies; within days, acts of "collective indiscipline" had spread to 54 divisions, while over 20,000 deserted. Unrest was almost entirely confined to the infantry, whose demands were largely non-political, including better economic support for families at home, and regular periods of leave, which Nivelle had ended.
Although the vast majority remained willing to defend their own lines, they refused to participate in offensive action, reflecting a complete breakdown of trust in the army leadership. Nivelle was removed from command on 15 May and replaced by Pétain, who resisted demands for drastic punishment and set about restoring morale by improving conditions. While exact figures are still debated, only 27 men were actually executed, with another 3,000 sentenced to periods of imprisonment; however, the psychological effects were long-lasting, one veteran commenting "Pétain has purified the unhealthy atmosphere...but they have ruined the heart of the French soldier".
Sinai and Palestine campaign (1917–1918)
In March and April 1917, at the First and Second Battles of Gaza, German and Ottoman forces stopped the advance of the Egyptian Expeditionary Force, which had begun in August 1916 at the Battle of Romani. At the end of October, the Sinai and Palestine campaign resumed, when General Edmund Allenby's XXth Corps, XXI Corps and Desert Mounted Corps won the Battle of Beersheba. Two Ottoman armies were defeated a few weeks later at the Battle of Mughar Ridge and, early in December, Jerusalem was captured following another Ottoman defeat at the Battle of Jerusalem. About this time, Friedrich Freiherr Kress von Kressenstein was relieved of his duties as the Eighth Army's commander, replaced by Djevad Pasha, and a few months later the commander of the Ottoman Army in Palestine, Erich von Falkenhayn, was replaced by Otto Liman von Sanders.
In early 1918, the front line was
German spring offensive (March–July 1918)
In December 1917, the Central Powers signed an armistice with Russia, thus freeing large numbers of German troops for use in the west. With German reinforcements and new American troops pouring in, the outcome was to be decided on the Western Front. The Central Powers knew that they could not win a protracted war, but they held high hopes for success based on a final quick offensive. Furthermore, both sides became increasingly fearful of social unrest and revolution in Europe. Thus, both sides urgently sought a decisive victory. Ludendorff drew up plans (codenamed Operation Michael) for the 1918 offensive on the Western Front. The spring offensive sought to divide the British and French forces with a series of feints and advances. The German leadership hoped to end the war before significant US forces arrived. The operation commenced on 21 March 1918 with an attack on British forces near Saint-Quentin. German forces achieved an unprecedented advance of 60 kilometres (37 mi).
The initial offensive was so successful that Kaiser Wilhelm II declared 24 March a national holiday. Many Germans thought victory was near. After heavy fighting, however, the offensive was halted. Lacking tanks or motorised artillery, the Germans were unable to consolidate their gains. The problems of re-supply were also exacerbated by increasing distances that now stretched over terrain that was shell-torn and often impassable to traffic.
Following Operation Michael, Germany launched Operation Georgette against the northern English Channel ports. The Allies halted the drive after limited territorial gains by Germany. The German Army to the south then conducted Operations Blücher and Yorck, pushing broadly towards Paris. Germany launched Operation Marne (Second Battle of the Marne) on 15 July, in an attempt to encircle Reims. The resulting counter-attack, which started the Hundred Days Offensive, marked the first successful Allied offensive of the war. By 20 July, the Germans had retreated across the Marne to their starting lines.
Hundred Days Offensive (August–November 1918)
The Allied counteroffensive, known as the Hundred Days Offensive, began on 8 August 1918, with the Battle of Amiens. The battle involved over 400 tanks and 120,000 British, Dominion, and French troops, and by the end of its first day a gap 24 kilometres (15 mi) long had been created in the German lines. The defenders displayed a marked collapse in morale, causing Ludendorff to refer to this day as the "Black Day of the German army".
On 13 August, at Spa, Hindenburg, Ludendorff, the Chancellor, and Foreign Minister Hintz agreed that the war could not be ended militarily and, on the following day, the German Crown Council decided that victory in the field was now most improbable. Austria and Hungary warned that they could continue the war only until December, and Ludendorff recommended immediate peace negotiations. Prince Rupprecht warned Prince Maximilian of Baden: "Our military situation has deteriorated so rapidly that I no longer believe we can hold out over the winter; it is even possible that a catastrophe will come earlier."
Allied advance to the Hindenburg Line
In September the Allies advanced to the Hindenburg Line in the north and centre. The Germans continued to fight strong rear-guard actions and launched numerous counterattacks, but positions and outposts of the Line continued to fall, with the BEF alone taking 30,441 prisoners in the last week of September. On 24 September an assault by both the British and French came within 3 kilometres (2 mi) of St. Quentin. The Germans had now retreated to positions along or behind the Hindenburg Line. That same day, Supreme Army Command informed the leaders in Berlin that armistice talks were inevitable.
When Bulgaria signed a separate armistice on 29 September, Ludendorff, having been under great stress for months, suffered something similar to a breakdown. It was evident that Germany could no longer mount a successful defence. The collapse of the Balkans meant that Germany was about to lose its main supplies of oil and food. Its reserves had been used up, even as US troops kept arriving at the rate of 10,000 per day.
Breakthrough of Macedonian Front (September 1918)
Allied forces started the
German Revolution (1918–1919)
In northern Germany, the German Revolution of 1918–1919 began at the end of October 1918. Units of the German Navy refused to set sail for a last, large-scale operation in a war they believed to be as good as lost, initiating the uprising. The sailors' revolt, which then ensued in the naval ports of Wilhelmshaven and Kiel, spread across the whole country within days and led to the proclamation of a republic on 9 November 1918, shortly thereafter to the abdication of Kaiser Wilhelm II, and to German surrender.
Armistices and capitulations
The collapse of the Central Powers came swiftly. Bulgaria was the first to sign an armistice, the
On 24 October, the Italians began a push that rapidly recovered territory lost after the Battle of Caporetto. This culminated in the Battle of Vittorio Veneto, which marked the end of the Austro-Hungarian Army as an effective fighting force. The offensive also triggered the disintegration of the Austro-Hungarian Empire. During the last week of October, declarations of independence were made in Budapest, Prague, and Zagreb. On 29 October, the imperial authorities asked Italy for an armistice, but the Italians continued advancing, reaching Trento, Udine, and Trieste. On 3 November, Austria-Hungary sent a flag of truce to ask for an armistice (Armistice of Villa Giusti). The terms, arranged by telegraph with the Allied Authorities in Paris, were communicated to the Austrian commander and accepted. The Armistice with Austria was signed in the Villa Giusti, near Padua, on 3 November. Austria and Hungary signed separate armistices following the overthrow of the Habsburg monarchy. In the following days, the Italian Army occupied Innsbruck and all Tyrol with over 20,000 soldiers.
On 30 October, the Ottoman Empire capitulated, signing the Armistice of Mudros.
New German government surrenders
With the military faltering and with widespread loss of confidence in the Kaiser leading to his abdication and fleeing of the country, Germany moved towards surrender. Prince Maximilian of Baden took charge of a new government on 3 October as Chancellor of Germany to negotiate with the Allies. Negotiations with President Wilson began immediately, in the hope that he would offer better terms than the British and French. Wilson demanded a constitutional monarchy and parliamentary control over the German military. There was no resistance when the Social Democrat Philipp Scheidemann on 9 November declared Germany to be a republic. The Kaiser, kings and other hereditary rulers all were removed from power and Wilhelm fled to exile in the Netherlands. It was the end of Imperial Germany; a new Germany had been born as the Weimar Republic.
On 11 November, at 5:00 am, an armistice with Germany was signed in a railroad carriage at Compiègne. At 11 am on 11 November 1918, a ceasefire came into effect. During the six hours between the signing of the armistice and its taking effect, opposing armies on the Western Front began to withdraw from their positions, but fighting continued along many areas of the front, as commanders wanted to capture territory before the war ended. The occupation of the Rhineland took place following the Armistice.
In the aftermath of the war, four empires disappeared: the German, Austro-Hungarian, Ottoman, and Russian.[n] Numerous nations regained their former independence, and new ones were created. Four dynasties, together with their ancillary aristocracies, fell as a result of the war: the Romanovs, the Hohenzollerns, the Habsburgs, and the Ottomans. Belgium and Serbia were badly damaged, as was France, with 1.4 million soldiers dead, not counting other casualties. Germany and Russia were similarly affected.
Formal end of the war
A formal state of war between the two sides persisted for another seven months, until the signing of the Treaty of Versailles with Germany on 28 June 1919. The United States Senate did not ratify the treaty despite public support for it, and did not formally end its involvement in the war until the Knox–Porter Resolution was signed on 2 July 1921 by President Warren G. Harding. For the United Kingdom and the British Empire, the state of war ceased under the provisions of the Termination of the Present War (Definition) Act 1918 with respect to:
After the Treaty of Versailles, treaties with Austria, Hungary, Bulgaria, and the Ottoman Empire were signed. The Ottoman Empire disintegrated, with much of its Levant territory awarded to various Allied powers as protectorates. The Turkish core in Anatolia was reorganised as the Republic of Turkey. The Ottoman Empire was to be partitioned by the Treaty of Sèvres of 1920. This treaty was never ratified by the Sultan and was rejected by the Turkish National Movement, leading to the victorious Turkish War of Independence and the much less stringent 1923 Treaty of Lausanne.
Some war memorials date the end of the war as being when the Versailles Treaty was signed in 1919, which was when many of the troops serving abroad finally returned home; by contrast, most commemorations of the war's end concentrate on the armistice of 11 November 1918. Legally, the formal peace treaties were not complete until the last, the Treaty of Lausanne, was signed. Under its terms, the Allied forces left Constantinople on 23 August 1923.
Peace treaties and national boundaries
After the war, there grew a certain amount of academic focus on the causes of war and on the elements that could make peace flourish. In part, these led to the institutionalization of peace and conflict studies, security studies and International Relations (IR) in general. The Paris Peace Conference imposed a series of peace treaties on the Central Powers officially ending the war. The 1919 Treaty of Versailles dealt with Germany and, building on Wilson's 14th point, brought into being the League of Nations on 28 June 1919.
The Central Powers had to acknowledge responsibility for "all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by" their aggression. In the Treaty of Versailles, this statement was Article 231. This article became known as the War Guilt clause as the majority of Germans felt humiliated and resentful. Overall the Germans felt they had been unjustly dealt with by what they called the "diktat of Versailles". German historian Hagen Schulze said the Treaty placed Germany "under legal sanctions, deprived of military power, economically ruined, and politically humiliated." Belgian historian Laurence Van Ypersele emphasises the central role played by memory of the war and the Versailles Treaty in German politics in the 1920s and 1930s:
Active denial of war guilt in Germany and German resentment at both reparations and continued Allied occupation of the Rhineland made widespread revision of the meaning and memory of the war problematic. The legend of the "stab in the back" and the wish to revise the "Versailles diktat", and the belief in an international threat aimed at the elimination of the German nation persisted at the heart of German politics. Even a man of peace such as [Gustav] Stresemann publicly rejected German guilt. As for the Nazis, they waved the banners of domestic treason and international conspiracy in an attempt to galvanise the German nation into a spirit of revenge. Like a Fascist Italy, Nazi Germany sought to redirect the memory of the war to the benefit of its own policies.
Meanwhile, new nations liberated from German rule viewed the treaty as recognition of wrongs committed against small nations by much larger aggressive neighbours.
The Russian Empire, which had withdrawn from the war in 1917 after the October Revolution, lost much of its western frontier as the newly independent nations of Estonia, Finland, Latvia, Lithuania, and Poland were carved from it. Romania took control of Bessarabia in April 1918.
After 123 years, Poland re-emerged as an independent country. The Kingdom of Serbia and its dynasty, as a "minor Entente nation" and the country with the most casualties per capita, became the backbone of a new multinational state, the Kingdom of Serbs, Croats and Slovenes, later renamed Yugoslavia. Czechoslovakia, combining the Kingdom of Bohemia with parts of the Kingdom of Hungary, became a new nation. Romania would unite all Romanian-speaking people under a single state leading to Greater Romania. Russia became the Soviet Union and lost Finland, Estonia, Lithuania, and Latvia, which became independent countries. The Ottoman Empire was soon replaced by Turkey and several other countries in the Middle East.
In the British Empire, the war unleashed new forms of nationalism. In Australia and New Zealand, the Battle of Gallipoli became known as those nations' "Baptism of Fire". It was the first major war in which the newly established countries fought, and it was one of the first times that Australian troops fought as Australians, not just subjects of the British Crown, and independent national identities for these nations took hold. Anzac Day, commemorating the Australian and New Zealand Army Corps (ANZAC), celebrates this defining moment.
In the aftermath of World War I, Greece fought against Turkish nationalists led by Mustafa Kemal, a war that eventually resulted in a massive population exchange between the two countries under the Treaty of Lausanne. According to various sources, several hundred thousand Greeks died during this period, which was tied in with the Greek genocide.
Of the 60 million European military personnel who were mobilised from 1914 to 1918, 8 million were killed, 7 million were permanently disabled, and 15 million were seriously injured. Germany lost 15.1% of its active male population, Austria-Hungary lost 17.1%, and France lost 10.5%. France mobilised 7.8 million men, of which 1.4 million died and 3.2 million were injured. Among the soldiers mutilated and surviving in the trenches, approximately 15,000 sustained horrific facial injuries, causing them to undergo social stigma and marginalisation; they were called the gueules cassées. In Germany, civilian deaths were 474,000 higher than in peacetime, due in large part to food shortages and malnutrition that weakened resistance to disease. These excess deaths are estimated as 271,000 in 1918, plus another 71,000 in the first half of 1919 when the blockade was still in effect. By the end of the war, starvation caused by famine had killed approximately 100,000 people in Lebanon. Between 5 and 10 million people died in the Russian famine of 1921. By 1922, there were between 4.5 million and 7 million homeless children in Russia as a result of nearly a decade of devastation from World War I, the Russian Civil War, and the subsequent famine of 1920–1922. Numerous anti-Soviet Russians fled the country after the Revolution; by the 1930s, the northern Chinese city of Harbin had 100,000 Russians. Thousands more emigrated to France, England, and the United States.
Diseases flourished in the chaotic wartime conditions. In 1914 alone, louse-borne epidemic typhus killed 200,000 in Serbia. From 1918 to 1922, Russia had about 25 million infections and 3 million deaths from epidemic typhus. In 1923, 13 million Russians contracted malaria, a sharp increase from the pre-war years. Starting in early 1918, a major influenza epidemic known as Spanish flu spread around the world, accelerated by the movement of large number of soldiers, often crammed together in camps and transport ships with poor sanitation. Overall, the Spanish flu killed at least 17 million to 25 million people, including an estimated 2.64 million Europeans and as many as 675,000 Americans. Moreover, between 1915 and 1926, an epidemic of encephalitis lethargica spread around the world affecting nearly five million people.
Rape of Belgium
The German invaders treated any resistance—such as sabotaging rail lines—as illegal and immoral, and shot the offenders and burned buildings in retaliation. In addition, they tended to suspect that most civilians were potential francs-tireurs (guerrillas) and, accordingly, took and sometimes killed hostages from among the civilian population. The German army executed over 6,500 French and Belgian civilians between August and November 1914, usually in near-random large-scale shootings of civilians ordered by junior German officers. The German Army destroyed 15,000–20,000 buildings—most famously the university library at Leuven—and generated a wave of refugees of over a million people. Over half the German regiments in Belgium were involved in major incidents. Thousands of workers were shipped to Germany to work in factories. British propaganda dramatising the Rape of Belgium attracted much attention in the United States, while Berlin said it was both lawful and necessary because of the threat of franc-tireurs like those in France in 1870. The British and French magnified the reports and disseminated them at home and in the United States, where they played a major role in dissolving support for Germany.
Austro-Hungarian war crimes in Serbia
Austria's propaganda machinery spread anti-Serb sentiment with the slogan "Serbien muss sterbien" (Serbia must die). During the war Austro-Hungarian officers in Serbia ordered troops to "exterminate and burn everything that is Serbian", and hangings and mass shootings were everyday occurrences. Austrian historian, Anton Holzer, wrote that the Austro-Hungarian army carried out "countless and systematic massacres…against the Serbian population. The soldiers invaded villages and rounded up unarmed men, women and children. They were either shot dead, bayoneted to death or hanged. The victims were locked into barns and burned alive. Women were sent up to the front lines and mass-raped. The inhabitants of whole villages were taken as hostages and humiliated and tortured."
A claim from a local spy that "traitors" were hiding in a certain house was enough to sentence the whole family to death by hanging. Priests were often hanged, under the accusation of spreading the spirit of treason among the people. Multiple source state that 30,000 Serbs, mostly civilians, were hanged by Austro-Hungarian forces in the first year of the war alone.
On 19 August 1915, the German submarine U-27 was sunk by the British Q-ship HMS Baralong. All German survivors were summarily executed by Baralong's crew on the orders of Lieutenant Godfrey Herbert, the captain of the ship. The shooting was reported to the media by American citizens who were on board the Nicosia, a British freighter loaded with war supplies, which was stopped by U-27 just minutes before the incident.
On 24 September, Baralong destroyed U-41, which was in the process of sinking the cargo ship Urbino. According to Karl Goetz, the submarine's commander, Baralong continued to fly the US flag after firing on U-41 and then rammed the lifeboat carrying the German survivors, sinking it.
Torpedoing of HMHS Llandovery Castle
The Canadian hospital ship HMHS Llandovery Castle was torpedoed by the German submarine SM U-86 on 27 June 1918 in violation of international law. Only 24 of the 258 medical personnel, patients, and crew survived. Survivors reported that the U-boat surfaced and ran down the lifeboats, machine-gunning survivors in the water. The U-boat captain, Helmut Brümmer-Patzig, was charged with war crimes in Germany following the war, but escaped prosecution by going to the Free City of Danzig, beyond the jurisdiction of German courts.
Blockade of Germany
After the war, the German government claimed that approximately 763,000 German civilians died from starvation and disease during the war because of the Allied blockade. An academic study done in 1928 put the death toll at 424,000. Germany protested that the Allies had used starvation as a weapon of war. Sally Marks argued that the German accounts of a hunger blockade are a "myth", as Germany did not face the starvation level of Belgium and the regions of Poland and northern France that it occupied. According to the British judge and legal philosopher Patrick Devlin, "The War Orders given by the Admiralty on 26 August  were clear enough. All food consigned to Germany through neutral ports was to be captured and all food consigned to Rotterdam was to be presumed consigned to Germany." According to Devlin, this was a serious breach of International Law, equivalent to German minelaying.
Chemical weapons in warfare
The German army was the first to successfully deploy chemical weapons during the Second Battle of Ypres (22 April – 25 May 1915), after German scientists working under the direction of
The effect of poison gas was not limited to combatants. Civilians were at risk from the gases as winds blew the poison gases through their towns, and they rarely received warnings or alerts of potential danger. In addition to absent warning systems, civilians often did not have access to effective gas masks. An estimated 100,000–260,000 civilian casualties were caused by chemical weapons during the conflict and tens of thousands more (along with military personnel) died from scarring of the lungs, skin damage, and cerebral damage in the years after the conflict ended. Many commanders on both sides knew such weapons would cause major harm to civilians but nonetheless continued to use them. British Field Marshal Douglas Haig wrote in his diary, "My officers and I were aware that such weapons would cause harm to women and children living in nearby towns, as strong winds were common in the battlefront. However, because the weapon was to be directed against the enemy, none of us were overly concerned at all."
Massacres of Albanians
During the Balkan Wars, Albanians were massacred by members of the Balkan League, mostly by Serbian and Montenegrin forces. These massacres continued during the First World War as foreign armies entered Albania. Bulgarian, Serbian, Montenegrin, and Greek forces committed several atrocities in Albania, during occupation, and in other regions inhabited by Albanians. Many villages were burned and destroyed, leaving 330,000 people without homes by 1915. According to the Committee of Kosovo, 50,000 Albanians were killed by Bulgarian forces and around 200,000 Albanians were killed by Serbian and Montenegrin forces.
Genocide and ethnic cleansing
The ethnic cleansing of the Ottoman Empire's Armenian population, including mass deportations and executions, during the final years of the Ottoman Empire is considered genocide. The Ottomans carried out organised and systematic massacres of the Armenian population at the beginning of the war and manipulated acts of Armenian resistance by portraying them as rebellions to justify further extermination. In early 1915, a number of Armenians volunteered to join the Russian forces and the Ottoman government used this as a pretext to issue the Tehcir Law (Law on Deportation), which authorised the deportation of Armenians from the Empire's eastern provinces to Syria between 1915 and 1918. The Armenians were intentionally marched to death and a number were attacked by Ottoman brigands. While an exact number of deaths is unknown, the International Association of Genocide Scholars estimates 1.5 million. The government of Turkey has consistently denied the genocide, arguing that those who died were victims of inter-ethnic fighting, famine, or disease during World War I; these claims are rejected by most historians.
Other ethnic groups were similarly attacked by the Ottoman Empire during this period, including Assyrians and Greeks, and some scholars consider those events to be part of the same policy of extermination. At least 250,000 Assyrian Christians, about half of the population, and 350,000–750,000 Anatolian and Pontic Greeks were killed between 1915 and 1922.
Many pogroms accompanied the Russian Revolution of 1917 and the ensuing Russian Civil War. 60,000–200,000 civilian Jews were killed in the atrocities throughout the former Russian Empire (mostly within the Pale of Settlement in present-day Ukraine). There were an estimated 7–12 million casualties during the Russian Civil War, mostly civilians.
Allied personnel was around 42,928,000 while Central personnel was near 25,248,000. The British soldiers of the war were initially volunteers but increasingly were conscripted into service. Surviving veterans, returning home, often found they could discuss their experiences only amongst themselves. Grouping together, they formed "veterans' associations" or "Legions". A small number of personal accounts of American veterans have been collected by the Library of Congress Veterans History Project.
Prisoners of war
About eight million soldiers surrendered and were held in POW camps during the war. All nations pledged to follow the Hague Conventions on fair treatment of prisoners of war, and the survival rate for POWs was generally much higher than that of combatants at the front.
Individual surrenders were uncommon; large units usually surrendered en masse. At the siege of Maubeuge about 40,000 French soldiers surrendered, at the battle of Galicia Russians took about 100,000 to 120,000 Austrian captives, at the Brusilov Offensive about 325,000 to 417,000 Germans and Austrians surrendered to Russians, and at the Battle of Tannenberg, 92,000 Russians surrendered. When the besieged garrison of Kaunas surrendered in 1915, some 20,000 Russians became prisoners, at the battle near Przasnysz (February–March 1915) 14,000 Germans surrendered to Russians, and at the First Battle of the Marne about 12,000 Germans surrendered to the Allies.
25–31% of Russian losses (as a proportion of those captured, wounded, or killed) were to prisoner status, for Austria-Hungary 32%, for Italy 26%, for France 12%, for Germany 9%; for Britain 7%. Prisoners from the Allied armies totalled about 1.4 million (not including Russia, which lost 2.5–3.5 million soldiers as prisoners). From the Central Powers about 3.3 million soldiers became prisoners; most of them surrendered to Russians. Germany held 2.5 million prisoners; Russia held 2.2–2.9 million; while Britain and France held about 720,000. Most were captured just before the Armistice. The United States held 48,000.
The most dangerous moment was the act of surrender when helpless soldiers were sometimes gunned down. Once prisoners reached a camp, conditions were, in general, satisfactory (and much better than in World War II), thanks in part to the efforts of the International Red Cross and inspections by neutral nations. However, conditions were terrible in Russia. Starvation was common for prisoners and civilians alike. About 15–20% of the prisoners in Russia died, and in Central Powers imprisonment 8% of Russians. In Germany, food was scarce, but only 5% died.
The Ottoman Empire often treated POWs poorly. Some 11,800 British Empire soldiers, most of them Indians, became prisoners after the siege of Kut in Mesopotamia in April 1916; 4,250 died in captivity. Although many were in a poor condition when captured, Ottoman officers forced them to march 1,100 kilometres (684 mi) to Anatolia. A survivor said: "We were driven along like beasts; to drop out was to die." The survivors were then forced to build a railway through the Taurus Mountains.
In Russia, when the prisoners from the Czechoslovak Legion of the Austro-Hungarian army were released in 1917, they re-armed themselves and briefly became a military and diplomatic force during the Russian Civil War.
While the Allied prisoners of the Central Powers were quickly sent home at the end of active hostilities, the same treatment was not granted to Central Power prisoners of the Allies and Russia, many of whom served as forced labour, e.g., in France until 1920. They were released only after many approaches by the Red Cross to the Supreme War Council. German prisoners were still being held in Russia as late as 1924.
Military attachés and war correspondents
Military and civilian observers from every major power closely followed the course of the war. Many were able to report on events from a perspective somewhat akin to modern "embedded" positions within the opposing land and naval forces.
Conscription was common in most European countries. However, it was controversial in English-speaking countries. It was especially unpopular among minority ethnic groups—especially the Irish Catholics in Ireland and Australia, and the French Catholics in Canada.
In Canada, the issue produced a major political crisis that permanently alienated the Francophones. It opened a political gap between French Canadians, who believed their true loyalty was to Canada and not to the British Empire, and members of the Anglophone majority, who saw the war as a duty to their British heritage.
Australia had a form of conscription at the outbreak of the war, as compulsory military training had been introduced in 1911. However, the Defence Act 1903 provided that unexempted males could be called upon only for home defence during times of war, not overseas service. Prime Minister Billy Hughes wished to amend the legislation to require conscripts to serve overseas, and held two non-binding referendums – one in 1916 and one in 1917 – in order to secure public support. Both were defeated by narrow margins, with farmers, the labour movement, the Catholic Church, and Irish-Australians combining to campaign for the "No" vote. The issue of conscription caused the 1916 Australian Labor Party split. Hughes and his supporters were expelled from the party, forming the National Labor Party and then the Nationalist Party. Despite the referendum results, the Nationalists won a landslide victory at the 1917 federal election.
In Britain, conscription resulted in the calling up of nearly every physically fit man in Britain—six of ten million eligible. Of these, about 750,000 died. Most deaths were those of young unmarried men; however, 160,000 wives lost husbands and 300,000 children lost fathers. Conscription during the First World War began when the British government passed the Military Service Act in 1916. The act specified that single men aged 18 to 40 years old were liable to be called up for military service unless they were widowed, with children, or ministers of a religion. There was a system of Military Service Tribunals to adjudicate upon claims for exemption upon the grounds of performing civilian work of national importance, domestic hardship, health, and conscientious objection. The law went through several changes before the war ended. Married men were exempt in the original Act, although this was changed in June 1916. The age limit was also eventually raised to 51 years old. Recognition of work of national importance also diminished, and in the last year of the war, there was some support for the conscription of clergy. Conscription lasted until mid-1919. Due to the political situation in Ireland, conscription was never applied there; only in England, Scotland and Wales.
In the United States, conscription began in 1917 and was generally well received, with a few pockets of opposition in isolated rural areas. The administration decided to rely primarily on conscription, rather than voluntary enlistment, to raise military manpower after only 73,000 volunteers enlisted out of the initial 1 million target in the first six weeks of the war. In 1917 10 million men were registered. This was deemed to be inadequate, so age ranges were increased and exemptions reduced, and so by the end of 1918 this increased to 24 million men that were registered with nearly 3 million inducted into the military services. The draft was universal and included blacks on the same terms as whites, although they served in different units. In all 367,710 black Americans were drafted (13% of total), compared to 2,442,586 white (87% of total).
Like all the armies of mainland Europe, Austria-Hungary relied on conscription to fill its ranks. Officer recruitment, however, was voluntary. The effect of this at the start of the war was that well over a quarter of the rank and file were Slavs, while more than 75% of the officers were ethnic Germans. This was much resented. The army has been described as being "run on colonial lines" and the Slav soldiers as "disaffected". Thus conscription contributed greatly to Austria's disastrous performance on the battlefield.
Support for the war
In the Balkans, Yugoslav nationalists such as the leader, Ante Trumbić, strongly supported the war, desiring the freedom of Yugoslavs from Austria-Hungary and other foreign powers and the creation of an independent Yugoslavia. The Yugoslav Committee, led by Trumbić, was formed in Paris on 30 April 1915 but shortly moved its office to London. In April 1918, the Rome Congress of Oppressed Nationalities met, including Czechoslovak, Italian, Polish, Transylvanian, and Yugoslav representatives who urged the Allies to support national self-determination for the peoples residing within Austria-Hungary.
In the Middle East, Arab nationalism soared in Ottoman territories in response to the rise of Turkish nationalism during the war, with Arab nationalist leaders advocating the creation of a pan-Arab state. In 1916, the Arab Revolt began in Ottoman-controlled territories of the Middle East in an effort to achieve independence.
In East Africa,
A number of socialist parties initially supported the war when it began in August 1914. But European socialists split on national lines, with the concept of class conflict held by radical socialists such as Marxists and syndicalists being overborne by their patriotic support for the war. Once the war began, Austrian, British, French, German, and Russian socialists followed the rising nationalist current by supporting their countries' intervention in the war.
Italian nationalism was stirred by the outbreak of the war and was initially strongly supported by a variety of political factions. One of the most prominent and popular Italian nationalist supporters of the war was Gabriele D'Annunzio, who promoted Italian irredentism and helped sway the Italian public to support intervention in the war. The Italian Liberal Party, under the leadership of Paolo Boselli, promoted intervention in the war on the side of the Allies and used the Dante Alighieri Society to promote Italian nationalism. Italian socialists were divided on whether to support the war or oppose it; some were militant supporters of the war, including Benito Mussolini and Leonida Bissolati. However, the Italian Socialist Party decided to oppose the war after anti-militarist protestors were killed, resulting in a general strike called Red Week. The Italian Socialist Party purged itself of pro-war nationalist members, including Mussolini. Mussolini, a syndicalist who supported the war on grounds of irredentist claims on Italian-populated regions of Austria-Hungary, formed the pro-interventionist Il Popolo d'Italia and the Fasci Rivoluzionario d'Azione Internazionalista ("Revolutionary Fasci for International Action") in October 1914 that later developed into the Fasci Italiani di Combattimento in 1919, the origin of fascism. Mussolini's nationalism enabled him to raise funds from Ansaldo (an armaments firm) and other companies to create Il Popolo d'Italia to convince socialists and revolutionaries to support the war.
On both sides there was large scale fundraising for soldiers' welfare, their dependents and for those injured. The Nail Men were a German example. Around the British empire there were many Patriotic Funds, including the Royal Patriotic Fund Corporation, Canadian Patriotic Fund, Queensland Patriotic Fund and, by 1919, there were 983 funds in New Zealand. At the start of the next world war the New Zealand funds were reformed, having been criticised as overlapping, wasteful and abused, but 11 were still functioning in 2002.
Opposition to the war
Many countries jailed those who spoke out against the conflict. These included Eugene Debs in the United States and Bertrand Russell in Britain. In the US, the Espionage Act of 1917 and Sedition Act of 1918 made it a federal crime to oppose military recruitment or make any statements deemed "disloyal". Publications at all critical of the government were removed from circulation by postal censors, and many served long prison sentences for statements of fact deemed unpatriotic.
A number of nationalists opposed intervention, particularly within states that the nationalists were hostile to. Although the vast majority of Irish people consented to participate in the war in 1914 and 1915, a minority of advanced Irish nationalists staunchly opposed taking part. The war began amid the Home Rule crisis in Ireland that had resurfaced in 1912, and by July 1914 there was a serious possibility of an outbreak of civil war in Ireland. Irish nationalists and Marxists attempted to pursue Irish independence, culminating in the Easter Rising of 1916, with Germany sending 20,000 rifles to Ireland to stir unrest in Britain. The UK government placed Ireland under martial law in response to the Easter Rising, though once the immediate threat of revolution had dissipated, the authorities did try to make concessions to nationalist feeling. However, opposition to involvement in the war increased in Ireland, resulting in the Conscription Crisis of 1918.
Other opposition came from conscientious objectors—some socialist, some religious—who refused to fight. In Britain, 16,000 people asked for conscientious objector status. Some of them, most notably prominent peace activist Stephen Hobhouse, refused both military and alternative service. Many suffered years of prison, including solitary confinement and bread and water diets. Even after the war, in Britain many job advertisements were marked "No conscientious objectors need apply".
On 1–4 May 1917, about 100,000 workers and soldiers of Petrograd, and after them, the workers and soldiers of other Russian cities, led by the Bolsheviks, demonstrated under banners reading "Down with the war!" and "all power to the soviets!" The mass demonstrations resulted in a crisis for the Russian Provisional Government. In Milan, in May 1917, Bolshevik revolutionaries organised and engaged in rioting calling for an end to the war, and managed to close down factories and stop public transportation. The Italian army was forced to enter Milan with tanks and machine guns to face Bolsheviks and anarchists, who fought violently until 23 May when the army gained control of the city. Almost 50 people (including three Italian soldiers) were killed and over 800 people arrested.
World War I began as a clash of 20th-century technology and 19th-century tactics, with the inevitably large ensuing casualties. By the end of 1917, however, the major armies, now numbering millions of men, had modernised and were making use of telephone, wireless communication, armoured cars, tanks (especially with the advent of the first prototype tank, Little Willie), and aircraft. Infantry formations were reorganised, so that 100-man companies were no longer the main unit of manoeuvre; instead, squads of 10 or so men, under the command of a junior NCO, were favoured.
Artillery also underwent a revolution. In 1914, cannons were positioned in the front line and fired directly at their targets. By 1917, indirect fire with guns (as well as mortars and even machine guns) was commonplace, using new techniques for spotting and ranging, notably, aircraft and the often overlooked field telephone. Counter-battery missions became commonplace, also, and sound detection was used to locate enemy batteries.
Germany was far ahead of the Allies in using heavy indirect fire. The German Army employed 150 mm (6 in) and 210 mm (8 in) howitzers in 1914, when typical French and British guns were only 75 mm (3 in) and 105 mm (4 in). The British had a 6-inch (152 mm) howitzer, but it was so heavy it had to be hauled to the field in pieces and assembled. The Germans also fielded Austrian 305 mm (12 in) and 420 mm (17 in) guns and, even at the beginning of the war, had inventories of various calibres of Minenwerfer, which were ideally suited for trench warfare.
Much of the combat involved trench warfare, in which hundreds often died for each metre gained. Many of the deadliest battles in history occurred during World War I. Such battles include Ypres, the Marne, Cambrai, the Somme, Verdun, and Gallipoli. The Germans employed the Haber process of nitrogen fixation to provide their forces with a constant supply of gunpowder despite the British naval blockade. Artillery was responsible for the largest number of casualties and consumed vast quantities of explosives. The large number of head wounds caused by exploding shells and fragmentation forced the combatant nations to develop the modern steel helmet, led by the French, who introduced the Adrian helmet in 1915. It was quickly followed by the Brodie helmet, worn by British Imperial and US troops, and in 1916 by the distinctive German Stahlhelm, a design, with improvements, still in use today.
The widespread use of chemical warfare was a distinguishing feature of the conflict. Gases used included chlorine, mustard gas and phosgene. Relatively few war casualties were caused by gas, as effective countermeasures to gas attacks were quickly created, such as gas masks. The use of chemical warfare and small-scale strategic bombing (as opposed to tactical bombing) were both outlawed by the Hague Conventions of 1899 and 1907, and both proved to be of limited effectiveness, though they captured the public imagination.
The most powerful land-based weapons were railway guns, weighing dozens of tons apiece.
Fixed-wing aircraft were first used militarily by the Italians in Libya on 23 October 1911 during the Italo-Turkish War for reconnaissance, soon followed by the dropping of grenades and aerial photography the next year. By 1914, their military utility was obvious. They were initially used for reconnaissance and ground attack. To shoot down enemy planes, anti-aircraft guns and fighter aircraft were developed. Strategic bombers were created, principally by the Germans and British, though the former used Zeppelins as well. Towards the end of the conflict, aircraft carriers were used for the first time, with HMS Furious launching Sopwith Camels in a raid to destroy the Zeppelin hangars at Tønder in 1918.
Manned observation balloons, floating high above the trenches, were used as stationary reconnaissance platforms, reporting enemy movements and directing artillery. Balloons commonly had a crew of two, equipped with parachutes, so that if there was an enemy air attack the crew could parachute to safety. At the time, parachutes were too heavy to be used by pilots of aircraft (with their marginal power output), and smaller versions were not developed until the end of the war; they were also opposed by the British leadership, who feared they might promote cowardice.
Recognised for their value as observation platforms, balloons were important targets for enemy aircraft. To defend them against air attack, they were heavily protected by anti-aircraft guns and patrolled by friendly aircraft; to attack them, unusual weapons such as air-to-air rockets were tried. Thus, the reconnaissance value of blimps and balloons contributed to the development of air-to-air combat between all types of aircraft, and to the trench stalemate, because it was impossible to move large numbers of troops undetected. The Germans conducted air raids on England during 1915 and 1916 with airships, hoping to damage British morale and cause aircraft to be diverted from the front lines, and indeed the resulting panic led to the diversion of several squadrons of fighters from France.
The introduction of
The non-military diplomatic and propaganda interactions among the nations were designed to build support for the cause or to undermine support for the enemy. For the most part, wartime diplomacy focused on five issues: propaganda campaigns; defining and redefining the war goals, which became harsher as the war went on; luring neutral nations (Italy, Ottoman Empire, Bulgaria, Romania) into the coalition by offering slices of enemy territory; and encouragement by the Allies of nationalistic minority movements inside the Central Powers, especially among Czechs, Poles, and Arabs. In addition, there were multiple peace proposals coming from neutrals, or one side or the other; none of them progressed very far.
Legacy and memory
... "Strange, friend," I said, "Here is no cause to mourn."
"None," said the other, "Save the undone years"...
The first tentative efforts to comprehend the meaning and consequences of modern warfare began during the initial phases of the war, and this process continued throughout and after the end of hostilities, and is still underway, more than a century later. As late as 2007, signs warning visitors to keep off certain paths at battlefield sites like Verdun and Somme remained in place as unexploded ordnance continued to pose a danger to farmers living near former battlegrounds. In France and Belgium locals who discover caches of unexploded munitions are assisted by weapons disposal units. In some places, plant life has still not returned to normal.
Teaching World War I has presented special challenges. When compared with World War II, the First World War is often thought to be "a wrong war fought for the wrong reasons". It lacks the metanarrative of good versus evil that characterizes the Second World War. Lacking recognizable heroes and villains, it is often taught thematically, invoking tropes like the wastefulness of war, the folly of generals and the innocence of soldiers. The complexity of the conflict is mostly obscured by these oversimplifications.
Historian Heather Jones argues that the historiography has been reinvigorated by the cultural turn in recent years. Scholars have raised entirely new questions regarding military occupation, radicalisation of politics, race, medical science, gender and mental health. Furthermore, new research has revised our understanding of five major topics that historians have long debated: Why the war began, why the Allies won, whether generals were responsible for high casualty rates, how the soldiers endured the horrors of trench warfare, and to what extent the civilian homefront accepted and endorsed the war effort.
Memorials were erected in thousands of villages and towns. Close to battlefields, those buried in improvised burial grounds were gradually moved to formal graveyards under the care of organisations such as the Commonwealth War Graves Commission, the American Battle Monuments Commission, the German War Graves Commission, and Le Souvenir français. Many of these graveyards also have central monuments to the missing or unidentified dead, such as the Menin Gate Memorial to the Missing and the Thiepval Memorial to the Missing of the Somme.
In 1915, John McCrae, a Canadian army doctor, wrote the poem In Flanders Fields as a salute to those who perished in the Great War. Published in Punch on 8 December 1915, it is still recited today, especially on Remembrance Day and Memorial Day.
National World War I Museum and Memorial in Kansas City, Missouri, is a memorial dedicated to all Americans who served in World War I. The Liberty Memorial was dedicated on 1 November 1921, when the supreme Allied commanders spoke to a crowd of more than 100,000 people.
The UK Government has budgeted substantial resources to the commemoration of the war during the period 2014 to 2018. The lead body is the Imperial War Museum. On 3 August 2014, French President François Hollande and German President Joachim Gauck together marked the centenary of Germany's declaration of war on France by laying the first stone of a memorial in Vieil Armand, known in German as Hartmannswillerkopf, for French and German soldiers killed in the war. During the Armistice centenary commemorations, French President Emmanuel Macron and German Chancellor Angela Merkel visited the site of the signing of the Armistice of Compiègne and unveiled a plaque to reconciliation.
The examples and perspective in this section deal primarily with the United Kingdom and do not represent a worldwide view of the subject. (June 2017)
World War I had a lasting impact on collective memory. It was seen by many in Britain as signalling the end of an era of stability stretching back to the Victorian period, and across Europe many regarded it as a watershed. Historian Samuel Hynes explained:
A generation of innocent young men, their heads full of high abstractions like Honour, Glory and England, went off to war to make the world safe for democracy. They were slaughtered in stupid battles planned by stupid generals. Those who survived were shocked, disillusioned and embittered by their war experiences, and saw that their real enemies were not the Germans, but the old men at home who had lied to them. They rejected the values of the society that had sent them to war, and in doing so separated their own generation from the past and from their cultural inheritance.
This has become the most common perception of World War I, perpetuated by the art, cinema, poems, and stories published subsequently. Films such as
These beliefs did not become widely shared because they offered the only accurate interpretation of wartime events. In every respect, the war was much more complicated than they suggest. In recent years, historians have argued persuasively against almost every popular cliché of World War I. It has been pointed out that, although the losses were devastating, their greatest impact was socially and geographically limited. The many emotions other than horror experienced by soldiers in and out of the front line, including comradeship, boredom, and even enjoyment, have been recognised. The war is not now seen as a 'fight about nothing', but as a war of ideals, a struggle between aggressive militarism and more or less liberal democracy. It has been acknowledged that British generals were often capable men facing difficult challenges and that it was under their command that the British army played a major part in the defeat of the Germans in 1918: a great forgotten victory.
Though these views have been discounted as "myths", they are common. They have dynamically changed according to contemporary influences, reflecting in the 1950s perceptions of the war as "aimless" following the contrasting Second World War and emphasising conflict within the ranks during times of class conflict in the 1960s. The majority of additions to the contrary are often rejected.
Writers such as
The social trauma caused by unprecedented rates of casualties manifested itself in different ways, which have been the subject of subsequent historical debate. Over 8 million Europeans died in the war. Millions suffered permanent disabilities. The war gave birth to fascism and Bolshevism and destroyed the dynasties that had ruled the Ottoman, Habsburg, Russian and German Empires.
The optimism of la belle époque was destroyed, and those who had fought in the war were referred to as the Lost Generation. For years afterward, people mourned the dead, the missing, and the many disabled. Many soldiers returned with severe trauma, suffering from shell shock (also called neurasthenia, a condition related to post-traumatic stress disorder). Many more returned home with few after-effects; however, their silence about the war contributed to the conflict's growing mythological status. Though many participants did not share in the experiences of combat or spend any significant time at the front, or had positive memories of their service, the images of suffering and trauma became the widely shared perception. Such historians as Dan Todman, Paul Fussell, and Samuel Heyns have all published works since the 1990s arguing that these common perceptions of the war are factually incorrect.
Discontent in Germany and Austria
The rise of Nazism and fascism included a revival of the nationalist spirit and a rejection of many post-war changes. Similarly, the popularity of the stab-in-the-back legend (German: Dolchstoßlegende) was a testament to the psychological state of defeated Germany and was a rejection of responsibility for the conflict. This conspiracy theory of the betrayal of the German war effort by Jews became common, and the German populace came to see themselves as victims. The widespread acceptance of the "stab-in-the-back" theory delegitimised the Weimar government and destabilised the system, opening it to extremes of right and left. The same occurred in Austria which did not consider itself responsible for the outbreak of the war and claimed not to have suffered a military defeat.
Communist and fascist movements around Europe drew strength from this theory and enjoyed a new level of popularity. These feelings were most pronounced in areas directly or harshly affected by the war. Adolf Hitler was able to gain popularity by using German discontent with the still controversial Treaty of Versailles. World War II was in part a continuation of the power struggle never fully resolved by World War I. Furthermore, it was common for Germans in the 1930s to justify acts of aggression due to perceived injustices imposed by the victors of World War I. American historian William Rubinstein wrote that:
The 'Age of Totalitarianism' included nearly all the infamous examples of genocide in modern history, headed by the Jewish Holocaust, but also comprising the mass murders and purges of the Communist world, other mass killings carried out by Nazi Germany and its allies, and also the Armenian Genocide of 1915. All these slaughters, it is argued here, had a common origin, the collapse of the elite structure and normal modes of government of much of central, eastern and southern Europe as a result of World War I, without which surely neither Communism nor Fascism would have existed except in the minds of unknown agitators and crackpots.
Macro- and micro-economic consequences devolved from the war. Families were altered by the departure of many men. With the death or absence of the primary wage earner, women were forced into the workforce in unprecedented numbers. At the same time, industry needed to replace the lost labourers sent to war. This aided the struggle for voting rights for women.
In all nations, the government's share of GDP increased, surpassing 50% in both Germany and France and nearly reaching that level in Britain. To pay for purchases in the United States, Britain cashed in its extensive investments in American railroads and then began borrowing heavily from Wall Street. President Wilson was on the verge of cutting off the loans in late 1916 but allowed a great increase in US government lending to the Allies. After 1919, the US demanded repayment of these loans. The repayments were, in part, funded by German reparations that, in turn, were supported by American loans to Germany. This circular system collapsed in 1931 and some loans were never repaid. Britain still owed the United States $4.4 billion[p] of World War I debt in 1934; the last installment was finally paid in 2015.
Britain turned to her colonies for help in obtaining essential war materials whose supply from traditional sources had become difficult. Geologists such as Albert Kitson were called on to find new resources of precious minerals in the African colonies. Kitson discovered important new deposits of manganese, used in munitions production, in the Gold Coast.
Article 231 of the Treaty of Versailles (the so-called "war guilt" clause) stated Germany accepted responsibility for "all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by the aggression of Germany and her allies." It was worded as such to lay a legal basis for reparations, and a similar clause was inserted in the treaties with Austria and Hungary. However, neither of them interpreted it as an admission of war guilt." In 1921, the total reparation sum was placed at 132 billion gold marks. However, "Allied experts knew that Germany could not pay" this sum. The total sum was divided into three categories, with the third being "deliberately designed to be chimerical" and its "primary function was to mislead public opinion ... into believing the "total sum was being maintained." Thus, 50 billion gold marks (12.5 billion dollars) "represented the actual Allied assessment of German capacity to pay" and "therefore … represented the total German reparations" figure that had to be paid.
This figure could be paid in cash or in-kind (coal, timber, chemical dyes, etc.). In addition, some of the territory lost—via the treaty of Versailles—was credited towards the reparation figure as were other acts such as helping to restore the Library of Louvain. By 1929, the Great Depression arrived, causing political chaos throughout the world. In 1932 the payment of reparations was suspended by the international community, by which point Germany had paid only the equivalent of 20.598 billion gold marks in reparations. With the rise of Adolf Hitler, all bonds and loans that had been issued and taken out during the 1920s and early 1930s were cancelled. David Andelman notes "refusing to pay doesn't make an agreement null and void. The bonds, the agreement, still exist." Thus, following the Second World War, at the London Conference in 1953, Germany agreed to resume payment on the money borrowed. On 3 October 2010, Germany made the final payment on these bonds.[q]
The Australian prime minister, Billy Hughes, wrote to the British prime minister, David Lloyd George, "You have assured us that you cannot get better terms. I much regret it, and hope even now that some way may be found of securing agreement for demanding reparation commensurate with the tremendous sacrifices made by the British Empire and her Allies." Australia received £5,571,720 war reparations, but the direct cost of the war to Australia had been £376,993,052, and, by the mid-1930s, repatriation pensions, war gratuities, interest and sinking fund charges were £831,280,947. Of about 416,000 Australians who served, about 60,000 were killed and another 152,000 were wounded.
The war contributed to the evolution of the wristwatch from women's jewellery to a practical everyday item, replacing the pocketwatch, which requires a free hand to operate. Trench watches were designed for use by the military as pocket watches were not as effective for combat. Military funding of advancements in radio contributed to the post-war popularity of the medium.
- Lists of World War I topics
- List of military engagements of World War I
- Outline of World War I
- World War I casualties
- World war
- Russian Empire during 1914–1917, Russian Republic during 1917. The Bolshevik government signed a separate peace with the Central Powers shortly after their armed seizure of power, resulting in a Central Powers victory on the Eastern Front of the war, and Russian defeat. However, this peace treaty was nullified by an Allied Powers victory on the Western Front, and the end of the war.
- Following the Armistice of Focșani causing Romania to withdraw from the Eastern Front of World War I; Romania signed a peace treaty with the Central Powers on 7 May 1918, however the treaty was canceled by Romania and Romania itself rejoined the Allied Powers on 10 November 1918.
- Bulgaria joined the Central Powers on 14 October 1915.
- The Ottoman Empire agreed to a secret alliance with Germany on 2 August 1914. It joined the war on the side of the Central Powers on 29 October 1914.
- The United States declared war on Austria-Hungary on 7 December 1917.
- The United States declared war on Germany on 6 April 1917.
- Only the Triple Alliance was a formal "alliance"; the others listed were informal patterns of support.
- Cvjetko Popović, Gavrilo Princip, Nedeljko Čabrinović, Trifko Grabež, and Vaso Čubrilović were Bosnian Serbs, while Muhamed Mehmedbašić was from the Bosniak Muslim community
- Bessarabia remained part of Romania until 1940, when it was annexed by Joseph Stalin as the Moldavian Soviet Socialist Republic; following the dissolution of the USSR in 1991, it became the independent Republic of Moldova
- Unlike the others, the successor state to the Russian Empire, the Union of Soviet Socialist Republics, retained similar external borders, via retaining or quickly recovering lost territories.
- A German attempt to use chemical weapons on the Russian front in January 1915 failed to cause casualties.
- 109 in this context – see Long and short scales
- World War I officially ended when Germany paid off the final amount of reparations imposed on it by the Allies.
- Shapiro & Epstein 2006, p. 329.
- Proffitt, Michael (13 June 2014). "Chief Editor's notes June 2014". Oxford English Dictionary's blog. Archived from the original on 15 April 2022. Retrieved 25 April 2022.
- "The First World War". Quite Interesting. Archived from the original on 3 January 2014. Also aired on QI Series I Episode 2, 16 September 2011, BBC Two.
- "Were they always called World War I and World War II?". Ask History. Archived from the original on 1 October 2015. Retrieved 24 October 2013.
- Braybon 2004, p. 8.
- "The Great War". The Independent. 17 August 1914. p. 228. Retrieved 17 May 2022.
- "great, adj., adv., and n". Oxford English Dictionary. Archived from the original on 14 May 2019. Retrieved 19 March 2012.
- "The war to end all wars". BBC News. 10 November 1998. Archived from the original on 19 June 2015. Retrieved 15 December 2015.
- Clark 2013, pp. 121–152.
- Zeldin 1977, p. 117.
- Keegan 1998, p. 52.
- Medlicott 1945, pp. 66–70.
- Keenan 1986, p. 20.
- Willmott 2003, p. 15.
- Fay 1930, pp. 290–293.
- Willmott 2003, p. 21.
- Herwig 1988, pp. 72–73.
- Moll & Luebbert 1980, pp. 153–185.
- Stevenson 2016, p. 45.
- Crisp 1976, pp. 174–196.
- Stevenson 2016, p. 42.
- McMeekin 2015, pp. 66–67.
- Clark 2013, p. 86.
- Clark 2013, pp. 251–252.
- McMeekin 2015, p. 69.
- McMeekin 2015, p. 73.
- Willmott 2003, pp. 2–23.
- Clark 2013, p. 288.
- Keegan 1998, pp. 48–49.
- Finestone & Massie 1981, p. 247.
- Smith 2010, p. ?.
- Butcher 2014, p. 103.
- Butcher 2014, pp. 188–189.
- Gilbert 1994, p. 16.
- Gilbert 1994, p. 17.
- "European powers maintain focus despite killings in Sarajevo – This Day in History". History.com. 30 June 1914. Archived from the original on 23 June 2011. Retrieved 26 December 2013.
- Willmott 2003, p. 26.
- Clark, Christopher (25 June 2014). Month of Madness. BBC Radio 4.
- Reports Service: Southeast Europe series. American Universities Field Staff. 1964. p. 44. Retrieved 7 December 2013.
... the assassination was followed by officially encouraged anti-Serb riots in Sarajevo ...
- Tomasevich 2001, p. 485.
- Velikonja 2003, p. 141.
- Stevenson 1996, p. 12.
- MacMillan 2013, p. 532.
- Willmott 2003, p. 27.
- Fromkin 2004, pp. 196–197.
- MacMillan 2013, p. 536.
- Lieven 2016, p. 326.
- Clark 2013, pp. 526–527.
- Martel 2014, p. 335.
- Gilbert 1994, p. 27.
- Clayton 2003, p. 45.
- Clark 2013, pp. 539–541.
- Gilbert 1994, p. 29.
- Coogan 2009, p. 48.
- Tsouras, Peter (19 July 2017). "The Kaiser's Question, 1914". HistoryNet. Archived from the original on 26 December 2021. Retrieved 26 December 2021.
- McMeekin 2014, pp. 342, 349.
- MacMillan 2013, pp. 579–580, 585.
- Crowe 2001, pp. 4–5.
- Willmott 2003, p. 29.
- Clark 2013, pp. 550–551.
- Strachan 2003, pp. 292–296, 343–354.
- Tucker & Roberts 2005, p. 172.
- Schindler 2002, pp. 159–195.
- "Veliki rat – Avijacija". rts.rs. RTS, Radio televizija Srbije, Radio Television of Serbia. Archived from the original on 10 July 2017. Retrieved 16 July 2019.
- "How was the first military airplane shot down". National Geographic. Archived from the original on 31 August 2015. Retrieved 5 August 2015.
- Stevenson 2004, p. 22.
- Horne 1964, p. 22.
- Stevenson 2004, p. 23.
- Holmes 2014, pp. 194, 211.
- Stevenson 2012, p. 54.
- Jackson 2018, p. 55.
- Lieven 2016, p. 327.
- Tucker & Roberts 2005, pp. 376–378.
- Horne 1964, p. 221.
- Donko 2012, p. 79.
- Keegan 1998, pp. 224–232.
- Falls 1960, pp. 79–80.
- Farwell 1989, p. 353.
- Brown 1994, pp. 197–198.
- Brown 1994, pp. 201–203.
- Kant, Vedica (24 September 2014). "India and WWI: Piecing together the impact of the Great War on the subcontinent". LSE. Retrieved 28 September 2022.
- "Participants from the Indian subcontinent in the First World War". Memorial Gates Trust. Archived from the original on 1 July 2019. Retrieved 12 December 2008.
- Horniman, Benjamin Guy (1984). British administration and the Amritsar massacre. Mittal Publications. p. 45.
- Raudzens 1990, p. 424.
- Raudzens 1990, pp. 421–423.
- Gilbert 1994, p. 99.
- Goodspeed 1985, p. 199.
- Duffy, Michael (22 August 2009). "Weapons of War: Poison Gas". Firstworldwar.com. Archived from the original on 21 August 2007. Retrieved 5 July 2012.
- Love 1996.
- Dupuy 1993, p. 1042.
- Grant 2005, p. 276.
- Lichfield, John (21 February 2006). "Verdun: myths and memories of the 'lost villages' of France". The Independent. Archived from the original on 22 October 2017. Retrieved 23 July 2013.
- Harris 2008, p. 271.
- "Living conditions". Trench Warfare. Archived from the original on 20 April 2018. Retrieved 19 April 2018.
- Taylor 2007, pp. 39–47. sfn error: no target: CITEREFTaylor2007 (help)
- Keene 2006, p. 5.
- Halpern 1995, p. 293.
- Zieger 2001, p. 50.
- Jeremy Black (June 2016). "Jutland's Place in History". Naval History. 30 (3): 16–21.
- Sheffield, Garry. "The First Battle of the Atlantic". World Wars in Depth. BBC. Archived from the original on 3 June 2019. Retrieved 11 November 2009.
- Gilbert 1994, p. 306.
- von der Porten 1969.
- Jones 2001, p. 80.
- Nova Scotia House of Assembly Committee on Veterans Affairs (9 November 2006). "Committee Hansard". Hansard. Archived from the original on 23 November 2011. Retrieved 12 March 2013.
- Price 1980
- "The Balkan Wars and World War I". p. 28. Library of Congress Country Studies.
- Tucker & Roberts 2005, p. 241–.
- Neiberg 2005, pp. 54–55.
- Tucker & Roberts 2005, pp. 1075–1076.
- DiNardo 2015, p. 102.
- Neiberg 2005, pp. 108–110.
- Tucker, Wood & Murphy 1999, pp. 150–152.
- Korsun, N. "The Balkan Front of the World War" (in Russian). militera.lib.ru. Archived from the original on 9 August 2013. Retrieved 27 September 2010.
- Doughty 2005, p. 491.
- Arthur J. Barker, The Neglected War: Mesopotamia, 1914–1918 (London: Faber, 1967)
- Crawford, John; McGibbon, Ian (2007). New Zealand's Great War: New Zealand, the Allies and the First World War. Exisle Publishing. pp. 219–220.
- Fromkin 2004, p. 119.
- Hinterhoff 1984, pp. 499–503
- The Encyclopedia Americana, 1920, v. 28, p. 403
- Northcote, Dudley S. (1922). "Saving Forty Thousand Armenians". Current History. New York Times Co. Archived from the original on 9 September 2021. Retrieved 9 September 2021.
- Sachar 1970, pp. 122–138.
- Gilbert 1994.
- Thompson 2009, p. 13.
- Thompson 2009, pp. 9–10.
- Gardner 2015, p. 120.
- Thompson 2009, p. 14.
- Thompson 2009, pp. 30–31.
- Gilbert 1994, p. 166.
- Thompson 2009, p. 57.
- Marshall & Josephy 1982, p. 108.
- Fornassin 2017, pp. 39–62.
- Thompson 2009, p. 163.
- Gilbert 1994, p. 317.
- Gilbert 1994, p. 482.
- Gilbert 1994, p. 484.
- Thompson 2009, p. 364.
- Gilbert 1994, p. 491.
- Jelavich 1992, pp. 441–442.
- Dumitru 2012, p. 171.
- Dumitru 2012, p. 170.
- Gilbert 1994, p. 282.
- Torrie 1978, pp. 7–8.
- Barrett 2013, pp. 96–98.
- România în anii primului război mondial, vol.2, p. 831
- Crampton 1994, pp. 24–25.
- Béla 1998, p. 429.
- Rothschild 1975, p. 314.
- Erlikman 2004, p. 51.
- Tucker & Roberts 2005, p. 715.
- Meyer 2006, pp. 152–154, 161, 163, 175, 182.
- Schindler 2003, p. ?.
- Tucker 2002, p. 119.
- Alexander Lanoszka; Michael A. Hunzeker (11 November 2018). "Why the First War lasted so long". The Washington Post. Archived from the original on 12 April 2022. Retrieved 11 November 2018.
- Keegan 1998, p. 345.
- Kernek 1970, pp. 721–766.
- Beckett 2007, p. 523.
- Winter 2014, pp. 110–132.
- Wheeler-Bennett 1938, pp. 36–41.
- Treaty of Bucharest with the Central Powers in May 1918
- Stevenson 2012, pp. 315–316.
- Stevenson 2012, p. 317.
- Gilbert 1994, p. 318.
- Grotelueschen 2006, pp. 14–15.
- Stevenson 2012, p. 318.
- Grotelueschen 2006, pp. 44–46.
- Stevenson 2012, p. 403.
- Clayton 2003, p. 124.
- Clayton 2003, p. 129.
- Strachan 2003, p. 244.
- Inglis 1995, p. 2.
- Humphries 2007, p. 66.
- Horne 1964, p. 323.
- Clayton 2003, p. 131.
- Marshall & Josephy 1982, p. 211.
- Horne 1964, p. 325.
- Erickson 2001, p. 163.
- "Text of the Decree of the Surrender of Jerusalem into British Control". First World War.com. Archived from the original on 14 June 2011. Retrieved 13 May 2015.
- "Who's Who – Kress von Kressenstein". First World War.com. Archived from the original on 20 November 2015. Retrieved 13 May 2015.
- "Who's Who – Otto Liman von Sanders". First World War.com. Archived from the original on 27 December 2007. Retrieved 13 May 2015.
- Erickson 2001, p. 195.
- Heyman 1997, pp. 146–147.
- Westwell 2004.
- Gray 1991, p. 86.
- Rickard 2007.
- Ayers 1919, p. 104.
- Rickard 2001.
- Gray & Argyle 1990
- McLellan, p. 49.
- Christie 1997, p. ?.
- Stevenson 2004, p. 380.
- Hull 2006, pp. 307–310.
- Stevenson 2004, p. 383.
- "The Battle of Dobro Polje – The Forgotten Balkan Skirmish That Ended WW1". Militaryhistorynow.com. Archived from the original on 23 September 2017. Retrieved 21 November 2019.
- "The Germans Could no Longer Keep up the Fight". historycollection.co. 22 February 2017. Retrieved 21 November 2019.
- K. Kuhl. "Die 14 Kieler Punkte" [The Kiel 14 points] (PDF). Archived (PDF) from the original on 12 April 2019. Retrieved 23 November 2018.
- Wette, Wolfram (2006). "Die Novemberrevolution – Kiel 1918". In Fleischhauer; Turowski (eds.). Kieler Erinnerungsorte. Boyens.
- "1918 Timeline". League of Nations Photo Archive. Archived from the original on 5 May 2016. Retrieved 20 November 2009.
- "The Battle of Dobro Polje – The Forgotten Balkan Skirmish That Ended WW1". Militaryhistorynow.com. 21 September 2017. Archived from the original on 23 September 2017. Retrieved 21 November 2019.
- "The Germans Could no Longer Keep up the Fight". historycollection.com. 22 February 2017. Archived from the original on 23 December 2019. Retrieved 21 November 2019.
- Axelrod 2018, p. 260.
- Andrea di Michele (2014). "Trento, Bolzano e Innsbruck: l'occupazione militare italiana del Tirolo (1918–1920)" [Trento, Bolzano and Innsbruck: The Italian Military Occupation of Tyrol (1918–1920)] (PDF). Trento e Trieste. Percorsi degli Italiani d'Austria dal '48 all'annessione (in Italian): 436–437. Archived from the original (PDF) on 2 October 2018.
La forza numerica del contingente italiano variò con il passare dei mesi e al suo culmine raggiunse i 20–22.000 uomini. [The numerical strength of the Italian contingent varied with the passing of months and at its peak reached 20–22,000 men.]
- "Clairière de l'Armistice" (in French). Ville de Compiègne. Archived from the original on 27 August 2007.
- Stevenson 2004, p. 385.
- Stevenson 2004, Chapter 17.
- "France's oldest WWI veteran dies" Archived 28 October 2016 at the Wayback Machine, BBC News, 20 January 2008.
- Tucker & Roberts 2005, p. 273
- "Harding Ends War; Signs Peace Decree at Senator's Home. Thirty Persons Witness Momentous Act in Frelinghuysen Living Room at Raritan". The New York Times. 3 July 1921. Archived from the original on 4 December 2013. Retrieved 18 September 2017.
- "No. 31773". The London Gazette. 10 February 1920. p. 1671.
- "No. 31991". The London Gazette. 23 July 1920. pp. 7765–7766.
- "No. 13627". The London Gazette. 27 August 1920. p. 1924.
- "No. 32421". The London Gazette. 12 August 1921. pp. 6371–6372.
- "No. 32964". The London Gazette. 12 August 1924. pp. 6030–6031.
- "Dates on war memorials" (PDF). War Memorials Trust. Archived (PDF) from the original on 12 January 2021. Retrieved 4 January 2021.
- Magliveras 1999, pp. 8–12.
- Northedge 1986, pp. 35–36.
- Schulze, Hagen (1998). Germany: A New History. Harvard U.P. p. 204.
- Ypersele, Laurence Van (2012). "Mourning and Memory, 1919–45". In Horne, John (ed.). A Companion to World War I. Wiley. p. 584.
- "The Surrogate Hegemon in Polish Postcolonial Discourse Ewa Thompson, Rice University" (PDF). Archived (PDF) from the original on 29 October 2013. Retrieved 27 October 2013.
- "Open-Site:Hungary". Archived from the original on 3 January 2022. Retrieved 11 January 2022.
- Frucht, p. 356.
- Clark 1927.
- "Appeals to Americans to Pray for Serbians" (PDF). The New York Times. 27 July 1918. Archived (PDF) from the original on 16 September 2018. Retrieved 12 June 2018.
- "Serbia Restored" (PDF). The New York Times. 5 November 1918. Archived (PDF) from the original on 16 September 2018. Retrieved 12 June 2018.
- Simpson, Matt (22 August 2009). "The Minor Powers During World War One – Serbia". firstworldwar.com. Archived from the original on 27 April 2010. Retrieved 27 May 2010.
- Cas Mudde. Racist Extremism in Central and Eastern Europe Archived 15 May 2016 at the Wayback Machine
- "'ANZAC Day' in London; King, Queen, and General Birdwood at Services in Abbey". The New York Times. 26 April 1916. Archived from the original on 15 July 2016. Retrieved 25 July 2018.
- Australian War Memorial. "The ANZAC Day tradition". Australian War Memorial. Archived from the original on 1 May 2008. Retrieved 2 May 2008.
- "The Diaspora Welcomes the Pope" Archived 4 June 2012 at the Wayback Machine, Der Spiegel Online. 28 November 2006.
- Hedges, Chris (17 September 2000). "A Few Words in Greek Tell of a Homeland Lost". The New York Times. Archived from the original on 25 November 2018. Retrieved 23 February 2017.
- Kitchen 2000, p. 22.
- Sévillia, Jean, Histoire Passionnée de la France, 2013, p. 395
- Howard 1993, p. 166.
- Saadi 2009.
- Patenaude, Bertrand M. (30 January 2007). "Food as a Weapon". Hoover Digest. Hoover Institution. Archived from the original on 19 July 2008. Retrieved 14 August 2014.
- Ball 1996, pp. 16, 211.
- "The Russians are coming (Russian influence in Harbin, Manchuria, China; economic relations)". The Economist (US). 14 January 1995. Archived from the original on 10 May 2007. (via Highbeam.com)
- Taliaferro 1972, p. 65.
- Spreeuwenberg 2018, pp. 2561–2567.
- Knobler et al. 2005.
- K. von Economo.Wiener klinische Wochenschrift, 10 May 1917, 30: 581–585. Die Encephalitis lethargica. Leipzig and Vienna, Franz Deuticke, 1918.
- Horne & Kramer 2001, ch 1–2, esp. p. 76.
- The claim of franc-tireurs in Belgium has been rejected: Horne & Kramer 2001, ch 3–4
- Horne & Kramer 2001, ch 5–8.
- Keegan 1998, pp. 82–83.
- Honzík, Miroslav; Honzíková, Hana (1984). 1914/1918, Léta zkázy a naděje. Czech Republic: Panorama.
- Deutsche Welle. "Austrougarski zločini u Srbiji | DW | 12 October 2014". DW.COM (in Serbian). Archived from the original on 14 December 2021. Retrieved 14 December 2021.
- "A History of the First World War in 100 Moments: Austro-Hungarian army". The Independent. 7 April 2014. Archived from the original on 17 February 2018. Retrieved 14 December 2021.
- "The blockade of Germany". nationalarchives.gov.uk. The National Archives. Archived from the original on 22 July 2004. Retrieved 11 November 2018.
- Raico, Ralph (26 April 2010). "The Blockade and Attempted Starvation of Germany". Mises Institute. Archived from the original on 24 March 2019. Retrieved 11 November 2018.
- Grebler, Leo (1940). The Cost of the World War to Germany and Austria–Hungary. Yale University Press. p. 78
- Marks 2013.
- D. Skopiansky, M. (1919). Les Atrocités Serbes (PDF). p. 119.
- Henry Morgenthau (1918). "XXV: Talaat Tells Why He "Deports" the Armenians". Ambassador Mogenthau's story. Brigham Young University. Archived from the original on 12 June 2012. Retrieved 6 June 2012.
- International Association of Genocide Scholars (13 June 2005). "Open Letter to the Prime Minister of Turkey Recep Tayyip Erdoğan". Archived from the original on 6 October 2007.
- Ferguson 2006, p. 177.
- "International Association of Genocide Scholars" (PDF). Archived from the original (PDF) on 10 October 2017. Retrieved 12 March 2013.
- Fromkin 1989, pp. 212–215.
- International Association of Genocide Scholars. "Resolution on genocides committed by the Ottoman empire" (PDF). Archived from the original (PDF) on 22 April 2008.
- Gaunt, David (2006). Massacres, Resistance, Protectors: Muslim-Christian Relations in Eastern Anatolia during World War I. Piscataway, New Jersey: Gorgias Press.[permanent dead link]
- "Pogroms". Encyclopaedia Judaica. Jewish Virtual Library. Archived from the original on 14 July 2014. Retrieved 17 November 2009.
- Mawdsley 2007, p. 287.
- Tucker & Roberts 2005, p. 2733.
- "Search Results (+(war:"worldwari")): Veterans History Project". American Folklife Center, Library of Congress. Archived from the original on 11 July 2017. Retrieved 23 May 2017.
- Phillimore & Bellot 1919, pp. 4–64.
- Ferguson 1999, pp. 368–369.
- Blair 2005.
- Cook 2006, pp. 637–665.
- "Максим Оськин – Неизвестные трагедии Первой мировой Пленные Дезертиры Беженцы – стр 24 – Читаем онлайн". Profismart.ru. Archived from the original on 17 April 2013. Retrieved 13 March 2013.
- Speed 1990.
- Ferguson 1999, Chapter 13.
- Morton 1992.
- Bass 2002, p. 107.
- "The Mesopotamia campaign". British National Archives. Archived from the original on 29 October 2021. Retrieved 10 March 2007.
- "Prisoners of Turkey: Men of Kut Driven along like beasts". Stolen Years: Australian Prisoners of War. Australian War Memorial. Archived from the original on 8 January 2009. Retrieved 10 December 2008.
- "ICRC in WWI: overview of activities". Icrc.org. Archived from the original on 19 July 2010. Retrieved 15 June 2010.
- "Germany: Notes". Time. 1 September 1924. Archived from the original on 13 November 2007. Retrieved 15 June 2010.
- "The Conscription Crisis". CBC. 2001. Archived from the original on 13 July 2014. Retrieved 14 August 2014.
- "Commonwealth Parliament from 1901 to World War I". Parliament of Australia. 4 May 2015. Archived from the original on 15 December 2018. Retrieved 15 December 2018.
- J.M. Main, Conscription: the Australian debate, 1901–1970 (1970) abstract Archived 7 July 2015 at archive.today
- Havighurst 1985, p. 131.
- Chelmsford, J.E. "Clergy and Man-Power", The Times 15 April 1918, p. 12
- Zinn, Howard (2003). A People's History of the United States. Harper Collins. p. 134.[edition needed]
- Tucker & Roberts 2005, p. 1189.
- Tucker & Roberts 2005, p. 1001
- Tucker & Roberts 2005, p. 117.
- "How Ethiopian prince scuppered Germany's WW1 plans". BBC News. 25 September 2016. Archived from the original on 13 April 2020. Retrieved 28 February 2017.
- Zewde, Bahru. A history. p. 126.
- Tucker & Roberts 2005, p. 1069.
- Tucker & Roberts 2005, p. 884.
- Tucker & Roberts 2005, p. 335.
- Tucker & Roberts 2005, p. 219.
- Tucker & Roberts 2005, p. 209.
- Tucker & Roberts 2005, p. 596
- Tucker & Roberts 2005, p. 826.
- Denis Mack Smith. 1997. Modern Italy: A Political History. Ann Arbor: The University of Michigan Press. p. 284.
- "No Immediate Need. Te Awamutu Courier". paperspast.natlib.govt.nz. 22 September 1939. Retrieved 16 June 2022.
- "Chapter 4 – Response from the Home Front". nzetc.victoria.ac.nz. 1986. Retrieved 16 June 2022.
- "5.2: Provincial patriotic councils". Office of the Auditor-General New Zealand. 2005. Retrieved 16 June 2022.
- Karp 1979
- Tucker & Roberts 2005, p. 584.
- O'Halpin, Eunan, The Decline of the Union: British Government in Ireland, 1892–1920, (Dublin, 1987)
- Lehmann & van der Veer 1999, p. 62.
- "Winchester Whisperer: The secret newspaper made by jailed pacifists". BBC News. 24 February 2014. Archived from the original on 7 February 2022. Retrieved 7 February 2022.
- Seton-Watson, Christopher. 1967. Italy from Liberalism to Fascism: 1870 to 1925. London: Methuen & Co. Ltd. p. 471
- Hartcup 1988, p. 154.
- Hartcup 1988, pp. 82–86.
- Mosier 2001, pp. 42–48.
- Hartcup 1988.
- Raudzens 1990, p. 421.
- Raudzens 1990.
- Heller 1984.
- Postwar pulp novels on future "gas wars" included Reginald Glossop's 1932 novel Ghastly Dew and Neil Bell's 1931 novel The Gas War of 1940.
- Lawrence Sondhaus, The Great War at Sea: A Naval History of the First World War (2014).
- Cross 1991
- Cross 1991, pp. 56–57.
- Winter 1983.
- Johnson 2001
- Stevenson 1988, p. [page needed].
- See Carnegie Endowment for International Peace (1921). Scott, James Brown (ed.). Official Statements of War Aims and Peace Proposals: December 1916 to November 1918. Washington, D.C., The Endowment.
- Wilfred Owen: poems, 1917, (Faber and Faber, 2004)
- Neiberg, Michael (2007). The World War I Reader. p. 1.
- "The intro the outbreak of the First World War". Cambridge Blog. 2014. Retrieved 17 November 2022.
- see Christoph Cornelissen, and Arndt Weinrich, eds. Writing the Great War – The Historiography of World War I from 1918 to the Present (2020) free download Archived 29 November 2020 at the Wayback Machine; full coverage for major countries.
- "Monumental Undertaking". kclibrary.org. 21 September 2015. Archived from the original on 29 May 2015. Retrieved 23 May 2015.
- "Commemoration website". 1914.org. Archived from the original on 8 February 2014. Retrieved 28 February 2014.
- "French, German Presidents Mark World War I Anniversary". France News.Net. Archived from the original on 3 April 2017. Retrieved 3 August 2014.
- "Armistice Day: Macron and Merkel mark end of World War One". BBC News. 10 November 2018. Archived from the original on 10 December 2020. Retrieved 30 March 2021.
- Todman 2005, pp. 153–221.
- "In Our Time Soldier's Home Summary & Analysis". SparkNotes. Retrieved 24 June 2023.
- Todman 2005, pp. xi–xv.
- Wohl 1979.
- Tucker & Roberts 2005, pp. 108–1086.
- Kitchen, Martin. "The Ending of World War One, and the Legacy of Peace". BBC. Archived from the original on 18 July 2008. Retrieved 11 March 2008.
- Baker 2006.
- "World War II". Encyclopædia Britannica. Archived from the original on 4 July 2008. Retrieved 12 November 2009.
- Chickering 2004.
- Cosgrave, Jenny (10 March 2015). "UK finally finishes paying for World War I". CNBC. Retrieved 20 March 2023.
- Green 1938, p. cxxvi.
- Marks 1978, pp. 231–232
- Marks 1978, p. 237
- Marks 1978, pp. 223–234
- Marks 1978, p. 233
- Hall, Allan (28 September 2010). "First World War officially ends". The Telegraph. Berlin. Archived from the original on 10 January 2022. Retrieved 15 March 2017.
- Suddath, Claire (4 October 2010). "Why Did World War I Just End?". Time. Archived from the original on 5 October 2010. Retrieved 1 July 2013.
- "World War I to finally end for Germany this weekend". CNN. 30 September 2010. Archived from the original on 16 March 2017. Retrieved 15 March 2017.
- MacMillan, Margaret (25 December 2010). "Ending the War to End All Wars". The New York Times. Archived from the original on 16 March 2017. Retrieved 15 March 2017.
- Souter 2000, p. 354.
- "From Wristwatches To Radio, How World War I Ushered in the Modern World". NPR. Archived from the original on 30 April 2018. Retrieved 5 April 2018.
- ISBN 978-1-4930-3192-4.
- Ayers, Leonard Porter (1919). The War with Germany: A Statistical Summary. Government Printing Office.
- Baker, Kevin (June 2006). "Stabbed in the Back! The past and future of a right-wing myth". Harper's Magazine.
- Ball, Alan M. (1996). And Now My Soul Is Hardened: Abandoned Children in Soviet Russia, 1918–1930. Berkeley: University of California Press. ISBN 978-0-520-20694-6., reviewed in Hegarty, Thomas J. (March–June 1998). "And Now My Soul Is Hardened: Abandoned Children in Soviet Russia, 1918–1930". Canadian Slavonic Papers. Archived from the originalon 9 May 2013.
- Barrett, Michael B (2013). Prelude to Blitzkrieg: The 1916 Austro-German Campaign in Romania. Indiana University Press. ISBN 978-0-253-00865-7.
- Bass, Gary Jonathan (2002). Stay the Hand of Vengeance: The Politics of War Crimes Tribunals. Princeton, New Jersey: Princeton University Press. p. 424. OCLC 248021790.
- Beckett, Ian (2007). The Great War. Longman. ISBN 978-1-4058-1252-8.
- Béla, Köpeczi (1998). History of Transylvania. Akadémiai Kiadó. ISBN 978-84-8371-020-3.
- Blair, Dale (2005). No Quarter: Unlawful Killing and Surrender in the Australian War Experience, 1915–1918. Charnwood, Australia: Ginninderra Press. OCLC 62514621.
- Braybon, Gail (2004). Evidence, History, and the Great War: Historians and the Impact of 1914–18. Berghahn Books. p. 8. ISBN 978-1-57181-801-0.
- ISBN 978-0-19-873113-9.
- Butcher, Tim (2014). The Trigger: Hunting the Assassin Who Brought the World to War (2015 ed.). Vintage. ISBN 978-0-09-958133-8.
- Cazacu, Gheorghe (2013). "Voluntarii români ardeleni din Rusia în timpul Primului Război Mondial [Transylvanian Romanian volunteers in Russia during the First World War]". Astra Salvensis (in Romanian) (1): 89–115.
- Chickering, Rodger (2004). Imperial Germany and the Great War, 1914–1918. Cambridge: Cambridge University Press. OCLC 55523473.
- Christie, Norm M (1997). The Canadians at Cambrai and the Canal du Nord, August–September 1918. CEF Books. ISBN 978-1-896979-18-2.
- Clayton, Anthony (2003). Paths of Glory; the French Army 1914–1918. Cassell. ISBN 978-0-304-35949-3.
- Clark, Charles Upson (1927). Bessarabia, Russia and Roumania on the Black Sea. New York: Dodd, Mead. . Retrieved 6 November 2008.
- ISBN 978-0-06-219922-5.
- Conlon, Joseph M. The historical impact of epidemic typhus (PDF). Montana State University. Archived from the original (PDF) on 11 June 2010. Retrieved 21 April 2009.
- Coogan, Tim (2009). Ireland in the 20th Century. Random House. ISBN 978-0-09-941522-0.
- Cook, Tim (2006). "The politics of surrender: Canadian soldiers and the killing of prisoners in the First World War". The Journal of Military History. 70 (3): 637–665. S2CID 155051361.
- Crampton, R. J. (1994). Eastern Europe in the twentieth century. Routledge. ISBN 978-0-415-05346-4.
- Crisp, Olga (1976). Studies in the Russian Economy before 1914. Palgrave Macmillan. ISBN 978-0-333-16907-0.
- Cross, Wilbur L. (1991). Zeppelins of World War I. New York: Paragon Press. OCLC 22860189.
- Crowe, David (2001). The Essentials of European History: 1914 to 1935, World War I and Europe in crisis. Research and Education Association. ISBN 978-0-87891-710-5.
- DiNardo, Richard (2015). Invasion: The Conquest of Serbia, 1915. Santa Barbara, California: Praeger. ISBN 978-1-4408-0092-4.
- Damian, Stefan (2012). "Volantini di guerra: la lingua romena in Italia nella propaganda del primo conflitto mondiale [War leaflets: the Romanian language in Italy in WWI propaganda]". Orrizonti Culturali Italo-Romeni (in Italian). 1.
- Donko, Wilhelm (2012). A Brief History of the Austrian Navy. epubli GmbH. ISBN 978-3-8442-2129-9.
- ISBN 978-0-674-01880-8.
- Dumitru, Laurentiu-Cristian (2012). "Preliminaries of Romania's entering the World War I". Bulletin of "Carol I" National Defence University, Bucharest. 1. Archived from the original on 19 March 2022. Retrieved 14 March 2022.
- Dupuy, R. Ernest and Trevor N. (1993). The Harper's Encyclopedia of Military History (4th ed.). Harper Collins Publishers. ISBN 978-0-06-270056-8.
- Erickson, Edward J. (2001). Ordered to Die: A History of the Ottoman Army in the First World War. Contributions in Military Studies. Vol. 201. Westport, Connecticut: Greenwood Press. OCLC 43481698.
- Erlikman, Vadim (2004). Poteri narodonaseleniia v XX veke [Population loss in the 20th century] (in Russian). Spravochnik.
- OCLC 460327352.
- OCLC 1088102671.
- ISBN 978-0-393-30564-7.
- Fay, Sidney B (1930). The Origins of the World War; Volume I (2nd ed.).
- OCLC 41124439.
- Ferguson, Niall (2006). The War of the World: Twentieth-Century Conflict and the Descent of the West. New York: Penguin Press. ISBN 978-1-59420-100-4.
- Finestone, Jeffrey; Massie, Robert K. (1981). The last courts of Europe. JM Dent & Sons. ISBN 978-0-460-04519-3.
- Fornassin, Alessio (2017). "The Italian Army's Losses in the First World War". Population. 72 (1): 39–62.
- ISBN 978-0-8050-0857-9.
- Fromkin, David (2004). Europe's Last Summer: Who Started the Great War in 1914?. Alfred A. Knopf. OCLC 53937943.
- Gardner, Hall (2015). The Failure to Prevent World War I: The Unexpected Armageddon. Routledge. ISBN 978-1-4724-3056-4.
- Grant, R.G. (2005). Battle: A Visual Journey Through 5,000 Years of Combat. DK Publishing. ISBN 978-0-7566-5578-5.
- Gray, Randal; Argyle, Christopher (1990). Chronicle of the First World War. New York: Facts on File. OCLC 19398100.
- Gilbert, Martin (1994). First World War. Stoddart Publishing. ISBN 978-0-7737-2848-6.
- Goodspeed, Donald James (1985). The German Wars 1914–1945. New York: Random House; Bonanza. ISBN 978-0-517-46790-9.
- Gray, Randal (1991). Kaiserschlacht 1918: the final German offensive. Osprey. ISBN 978-1-85532-157-1.
- Green, John Frederick Norman (1938). "Obituary: Albert Ernest Kitson". Geological Society Quarterly Journal. 94.
- Grotelueschen, Mark Ethan (2006). The AEF Way of War: The American Army and Combat in World War I. Cambridge University Press. ISBN 978-0-521-86434-3.
- Halpern, Paul G. (1995). A Naval History of World War I. New York: Routledge. OCLC 60281302.
- Hammond's Frontier Atlas of the World War. C. S. Hammond & Company. 1916.
- Harris, J.P. (2008). Douglas Haig and the First World War (2009 ed.). CUP. ISBN 978-0-521-89802-7.
- ISBN 978-0-08-033591-9.
- Havighurst, Alfred F. (1985). Britain in transition: the twentieth century (4th ed.). University of Chicago Press. ISBN 978-0-226-31971-1.
- Heller, Charles E. (1984). Chemical warfare in World War I: the American experience, 1917–1918. Fort Leavenworth, Kansas: Combat Studies Institute.
- Herwig, Holger (1988). "The Failure of German Sea Power, 1914–1945: Mahan, Tirpitz, and Raeder Reconsidered". The International History Review. 10 (1): 68–105. JSTOR 40107090.
- Heyman, Neil M. (1997). World War I. Guides to historic events of the twentieth century. Westport, Connecticut: Greenwood Press. OCLC 36292837.
- Hinterhoff, Eugene (1984). "The Campaign in Armenia". In Young, Peter (ed.). Marshall Cavendish Illustrated Encyclopedia of World War I. Vol. ii. New York: Marshall Cavendish. ISBN 978-0-86307-181-2.
- Holmes, T.M. (April 2014). "Absolute Numbers: The Schlieffen Plan as a Critique of German Strategy in 1914". ISSN 1477-0385.
- Horne, Alistair (1964). The Price of Glory (1993 ed.). Penguin. ISBN 978-0-14-017041-2.
- Horne, John; Kramer, Alan (2001). German Atrocities, 1914: A History of Denial. Yale University Press. OCLC 47181922.
- Howard, N.P. (1993). "The Social and Political Consequences of the Allied Food Blockade of Germany, 1918–19". German History. 11 (2): 161–188.
- ISBN 978-0-8014-7293-0.
- Humphries, Mark Osborne (2007). ""Old Wine in New Bottles": A Comparison of British and Canadian Preparations for the Battle of Arras". In Hayes, Geoffrey; Iarocci, Andrew; Bechthold, Mike (eds.). Vimy Ridge: A Canadian Reassessment. Waterloo: Wilfrid Laurier University Press. ISBN 978-0-88920-508-6.
- Inglis, David (1995). Vimy Ridge: 1917–1992, A Canadian Myth over Seventy Five Years (PDF). Burnaby: Simon Fraser University. Archived (PDF) from the original on 16 September 2018. Retrieved 23 July 2013.
- Jackson, Julian (2018). A Certain Idea of France: The Life of Charles de Gaulle. Allen Lane. ISBN 978-1-84614-351-9.
- Jelavich, Barbara (1992). "Romania in the First World War: The Pre-War Crisis, 1912–1914". The International History Review. 14 (3): 441–451. JSTOR 40106597.
- OCLC 45991828.
- Jones, Howard (2001). Crucible of Power: A History of US Foreign Relations Since 1897. Scholarly Resources Books. OCLC 46640675.
- Karp, Walter (1979). The Politics of War. Harper & Row. OCLC 4593327.
- ISBN 978-0-09-180178-6.
- Keenan, George (1986). The Fateful Alliance: France, Russia and the Coming of the First World War. Manchester University Press. ISBN 978-0-7190-1707-0.
- Keene, Jennifer D (2006). World War I. Daily Life Through History Series. Westport, Connecticut: Greenwood Press. p. 5. OCLC 70883191.
- Kernek, Sterling (December 1970). "The British Government's Reactions to President Wilson's 'Peace' Note of December 1916". The Historical Journal. 13 (4): 721–766. S2CID 159979098.
- Kitchen, Martin (2000) . Europe Between the Wars. New York: Longman. OCLC 247285240.
- Knobler, S. L.; Mack, A.; Mahmoud, A.; Lemon, S. M., eds. (2005). The Threat of Pandemic Influenza: Are We Ready? Workshop Summary. Contributors: Institute of Medicine; Board on Global Health; Forum on Microbial Threats. Washington DC: National Academies Press. PMID 20669448.
- Lehmann, Hartmut; van der Veer, Peter, eds. (1999). Nation and religion: perspectives on Europe and Asia. Princeton, New Jersey: Princeton University Press. OCLC 39727826.
- Lieven, Dominic (2016). Towards the Flame: Empire, War and the End of Tsarist Russia. Penguin. ISBN 978-0-14-139974-4.
- Love, Dave (May 1996). "The Second Battle of Ypres, April 1915". Sabretache. 26 (4). Archived from the original on 16 September 2018. Retrieved 20 November 2009.
- ISBN 978-0-8129-9470-4.
- Magliveras, Konstantinos D. (1999). Exclusion from Participation in International Organisations: The Law and Practice behind Member States' Expulsion and Suspension of Membership. Martinus Nijhoff Publishers. ISBN 978-90-411-1239-2.
- Marble, Sanders (2018). King of Battle: Artillery in World War I. Brill. ISBN 978-90-04-30524-3.
- Marks, Sally (1978). "The Myths of Reparations". S2CID 144072556.
- Marks, Sally (September 2013). "Mistakes and Myths: The Allies, Germany, and the Versailles Treaty, 1918–1921". The Journal of Modern History. 85 (3): 650–651. S2CID 154166326.
- Martel, Gordon (2014). The Month that Changed the World: July 1914. OUP. ISBN 978-0-19-966538-9.
- Marshall, S. L. A.; Josephy, Alvin M. (1982). The American heritage history of World War I. American Heritage Pub. Co. : Bonanza Books : Distributed by Crown Publishers. OCLC 1028047398.
- Mawdsley, Evan (2007). The Russian Civil War. New York: Pegasus Books. ISBN 978-1-68177-009-3.
- McLellan, Edwin N. The United States Marine Corps in the World War. Archived from the original on 16 September 2018. Retrieved 26 October 2009.
- McMeekin, Sean (2014). July 1914: Countdown to War. Icon Books. ISBN 978-1-84831-657-7.
- McMeekin, Sean (2015). The Ottoman Endgame: War, Revolution and the Making of the Modern Middle East, 1908–1923 (2016 ed.). Penguin. ISBN 978-0-7181-9971-5.
- Medlicott, W.N. (1945). "Bismarck and the Three Emperors' Alliance, 1881–87". Transactions of the Royal Historical Society. 27: 61–83. S2CID 154285570.
- Meyer, Gerald J (2006). A World Undone: The Story of the Great War 1914 to 1918. Random House. ISBN 978-0-553-80354-9.
- Mitrasca, Marcel (2007). Moldova: A Romanian Province Under Russian Rule: Diplomatic History from the Archives of the Great Powers. Algora Publishing. ISBN 978-0-87586-184-5.
- Moll, Kendall D; Luebbert, Gregory M (1980). "Arms Race and Military Expenditure Models: A Review". The Journal of Conflict Resolution. 24 (1): 153–185. S2CID 155405415.
- Morton, Desmond (1992). Silent Battle: Canadian Prisoners of War in Germany, 1914–1919. Toronto: Lester Publishing. OCLC 29565680.
- Mosier, John (2001). "Germany and the Development of Combined Arms Tactics". Myth of the Great War: How the Germans Won the Battles and How the Americans Saved the Allies. New York: Harper Collins. ISBN 978-0-06-019676-9.
- OCLC 56592292.
- Northedge, F.S. (1986). The League of Nations: Its Life and Times, 1920–1946. New York: Holmes & Meier. ISBN 978-0-7185-1316-0.
- Părean, Ioan (2002). "Soldați ai României Mari. Din prizonieratul rusesc în Corpul Voluntarilor transilvăneni și bucovineni [Soldiers of Greater Romania; from Russian captivity to the Transylvanian and Bucovina Volunteer Corps]" (PDF). Romanian Army Academy Journal (in Romanian). 3–4 (27–28): 1–5.
- Phillimore, George Grenville; Bellot, Hugh H.L. (1919). "Treatment of Prisoners of War". Transactions of the Grotius Society. 5: 47–64. OCLC 43267276.
- Price, Alfred (1980). Aircraft versus Submarine: the Evolution of the Anti-submarine Aircraft, 1912 to 1980. London: Jane's Publishing. hydrophones
- Raudzens, George (October 1990). "War-Winning Weapons: The Measurement of Technological Determinism in Military History". The Journal of Military History. 54 (4): 403–434. JSTOR 1986064.
- Rickard, J. (5 March 2001). "Erich von Ludendorff [sic], 1865–1937, German General". Military History Encyclopedia on the Web. Archived from the original on 10 January 2008. Retrieved 6 February 2008.
- Rickard, J. (27 August 2007). "The Ludendorff Offensives, 21 March–18 July 1918". historyofwar.org. Archived from the original on 10 October 2017. Retrieved 12 September 2018.
- Roden, Mike. "The Lost Generation – myth and reality". Aftermath – when the Boys Came Home. Archived from the original on 1 December 2009. Retrieved 13 April 2022.
- Rothschild, Joseph (1975). East-Central Europe between the Two World Wars. University of Washington Press. ISBN 978-0-295-95350-2.
- Saadi, Abdul-Ilah (12 February 2009). "Dreaming of Greater Syria". Al Jazeera. Archived from the original on 13 May 2011. Retrieved 14 August 2014.
- Sachar, Howard Morley (1970). The emergence of the Middle East, 1914–1924. Allen Lane. OCLC 153103197.
- Schindler, J. (2003). "Steamrollered in Galicia: The Austro-Hungarian Army and the Brusilov Offensive, 1916". War in History. 10 (1): 27–59. S2CID 143618581.
- Schindler, John R. (2002). "Disaster on the Drina: The Austro-Hungarian Army in Serbia, 1914". War in History. 9 (2): 159–195. S2CID 145488166.
- Șerban, Ioan I (1997). "Din activitatea desfășurată în Vechiul Regat de voluntarii și refugiații ardeleni și bucovineni în slujba idealului național [Nationalist activity in the Kingdom of Romania by Transylvanian and Bucovina volunteers and refugees]". Annales Universitatis Apulensis (in Romanian) (37): 101–111.
- Șerban, Ioan I (2000). "Constituirea celui de-al doilea corp al voluntarilor români din Rusia – august 1918 [Establishment of the second body of Romanian volunteers in Russia – August 1918]". Apulum (in Romanian) (37): 153–164.
- Shapiro, Fred R.; Epstein, Joseph (2006). The Yale Book of Quotations. Yale University Press. ISBN 978-0-300-10798-2.
- Smith, David James (2010). One Morning in Sarajevo. Hachette UK. ISBN 978-0-297-85608-5.
He was photographed on the way to the station and the photograph has been reproduced many times in books and articles, claiming to depict the arrest of Gavrilo Princip. But there is no photograph of Gavro's arrest—this photograph shows the arrest of Behr.
- Souter, Gavin (2000). Lion & Kangaroo: the initiation of Australia. Melbourne: Text Publishing. OCLC 222801639.
- Smele, Jonathan. "War and Revolution in Russia 1914–1921". World Wars in-depth. BBC. Archived from the original on 23 October 2011. Retrieved 12 November 2009.
- Speed, Richard B III (1990). Prisoners, Diplomats and the Great War: A Study in the Diplomacy of Captivity. New York: Greenwood Press. OCLC 20694547.
- Spreeuwenberg, P (2018). "Reassessing the Global Mortality Burden of the 1918 Influenza Pandemic". PMID 30202996.
- Stevenson, David (1988). The First World War and International Politics. Oxford University Press. ISBN 978-0-19-873049-1.
- OCLC 33079190.
- Stevenson, David (2004). Cataclysm: The First World War as Political Tragedy. New York: Basic Books. p. 560. OCLC 54001282.
- Stevenson, David (2012). 1914–1918: The History of the First World War. Penguin. ISBN 978-0-7181-9795-7.
- Stevenson, David (2016). Mahnken, Thomas (ed.). Land armaments in Europe, 1866–1914 in Arms Races in International Politics: From the Nineteenth to the Twenty-First Century. Oxford University Press. ISBN 978-0-19-873526-7.
- OCLC 53075929.
- Taliaferro, William Hay (1972) . Medicine and the War. Books for Libraries Press. ISBN 978-0-8369-2629-3.
- Thompson, Mark (2009). The White War: Life and Death on the Italian Front, 1915–1919. Faber & Faber. ISBN 978-0-571-22333-6.
- Todman, Dan (2005). The Great War: Myth and Memory. A & C Black. ISBN 978-0-8264-6728-7.
- . Retrieved 4 December 2013.
- Torrie, Glenn E. (1978). "Romania's Entry into the First World War: The Problem of Strategy" (PDF). Emporia State Research Studies. Emporia State University. 26 (4): 7–8.
- Tschanz, David W. Typhus fever on the Eastern front in World War I. Montana State University. Archived from the original on 11 June 2010. Retrieved 12 November 2009.
- Tucker, Spencer C.; Roberts, Priscilla Mary (2005). Encyclopedia of World War I. Santa Barbara: ABC-Clio. OCLC 61247250.
- Tucker, Spencer C.; Wood, Laura Matysek; Murphy, Justin D. (1999). The European powers in the First World War: an encyclopedia. Taylor & Francis. . Retrieved 6 June 2020.
- Tucker, Spencer (2002). The Great War, 1914–1918. Routledge. ISBN 978-1-134-81750-4.
- Velikonja, Mitja (2003). Religious Separation and Political Intolerance in Bosnia-Herzegovina. Texas A&M University Press. p. 141. ISBN 978-1-58544-226-3.
- OCLC 164543865.
- Westwell, Ian (2004). World War I Day by Day. St. Paul, Minnesota: MBI Publishing. pp. 192pp. OCLC 57533366.
- Wheeler-Bennett, John W. (1938). Brest-Litovsk:The forgotten peace. Macmillan.
- Willmott, H.P. (2003). World War I. Dorling Kindersley. OCLC 52541937.
- Winter, Denis (1983). The First of the Few: Fighter Pilots of the First World War. Penguin. ISBN 978-0-14-005256-5.
- Winter, Jay, ed. (2014). The Cambridge History of the First World War (2016 ed.). Cambridge University Press. ISBN 978-1-316-60066-5.
- Wohl, Robert (1979). The Generation of 1914 (3rd ed.). Harvard University Press. ISBN 978-0-674-34466-2.
- Zeldin, Theodore (1977). France, 1848–1945: Volume II: Intellect, Taste, and Anxiety (1986 ed.). Clarendon Press. ISBN 978-0-19-822125-8.
- Zieger, Robert H. (2001). America's Great War: World War I and the American experience. Rowman & Littlefield. ISBN 978-0-8476-9645-1.
- Links to other WWI Sites, worldwide links from Brigham Young U.
- The World War One Document Archive, from Brigham Young U.
- International Encyclopedia of the First World War
- Records on the outbreak of World War I from the UK Parliamentary Collections
- The Heritage of the Great War / First World War. Graphic color photos, pictures and music
- A multimedia history of World War I
- European Newspapers from the start of the First World War and the end of the war
- WWI Films on the European Film Gateway
- The British Pathé WW1 Film Archive Archived 24 March 2019 at the Wayback Machine
- World War I British press photograph collection – A sampling of images distributed by the British government during the war to diplomats overseas, from the UBC Library Digital Collections
- Personal accounts of American World War I veterans, Veterans History Project, Library of Congress.
- National Library of New Zealand
- State Library of New South Wales
- US Library of Congress
- Indiana University Bloomington Archived 5 June 2015 at the Wayback Machine
- New York University Archived 5 April 2015 at the Wayback Machine
- University of Alberta
- California State Library, California History Room. Collection: California. State Council of Defense. California War History Committee. Records of Californians who served in World War I, 1918–1922.