SMS Roon

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Kaiser Wilhelm Canal
, c. 1910
History
German Empire
NameRoon
NamesakeAlbrecht von Roon
BuilderKaiserliche Werft, Kiel
Laid down1 August 1902
Launched27 June 1903
Commissioned5 April 1906
Decommissioned22 September 1911
Commissioned2 August 1914
Decommissioned4 February 1916
Stricken25 November 1920
FateScrapped 1921
General characteristics
Class and typeRoon-class armored cruiser
Displacement
Length127.8 m (419 ft 3 in)
Beam20.2 m (66 ft 3 in)
Draft7.76 m (25 ft 6 in)
Installed power
Propulsion
  • 3 × screw propellers
  • 3 ×
    triple-expansion steam engines
Speed21.1 knots (39.1 km/h; 24.3 mph)
Range4,200 nmi (7,800 km; 4,800 mi) at 12 knots (22 km/h; 14 mph)
Crew
  • 35 officers
  • 598 enlisted men
Armament
Armor
  • Belt: 8–10 cm (3.1–3.9 in)
  • Turrets: 15 cm (5.9 in)
  • Deck: 4–6 cm (1.6–2.4 in)

SMS Roon

launched in June 1903, and commissioned in April 1906. The ship was armed with a main battery of four 21 cm (8.3 in) guns and had a top speed of 20.4 knots (37.8 km/h; 23.5 mph). Like many of the late armored cruisers, Roon was quickly rendered obsolescent by the advent of the battlecruiser
; as a result, her career was limited.

Roon served in I Scouting Group, the reconnaissance force of the High Seas Fleet, for the duration of her peacetime career, including several stints as the flagship of the group's deputy commander. During this period, the ship was occupied with training exercises and made several cruises in the Atlantic Ocean. In 1907, she visited the United States to represent Germany during the Jamestown Exposition. In September 1911 she was decommissioned and placed in reserve.

Three years later, the ship was

broken up
in 1921.

Design

Plan and elevation of the Roon class

The two Roon-class cruisers were ordered in 1902 as part of the fleet expansion program specified by the

metric horsepower (2,000 ihp) and speed by 0.5 knots (0.93 km/h; 0.58 mph).[1] The launch of the British battlecruiser HMS Invincible in 1907 quickly rendered all of the armored cruisers that had been built by the world's navies obsolescent.[2]

Roon was 127.8 m (419 ft 3 in)

screw propeller, with steam provided by sixteen coal-fired water-tube boilers. The ship's propulsion system developed a total of 19,000 metric horsepower (19,000 ihp) and yielded a maximum speed of 21.1 knots (39.1 km/h; 24.3 mph) on trials, falling short of her intended speed of 22 knots (41 km/h; 25 mph). She carried up to 1,570 t (1,550 long tons) of coal, which enabled a maximum range of up to 4,200 nautical miles (7,800 km; 4,800 mi) at a cruising speed of 12 knots (22 km/h; 14 mph). Roon had a crew of 35 officers and 598 enlisted men.[3][4]

She was armed with four 21 cm (8.3 in) SK L/40 guns arranged in two twin-gun turrets,[b] one on either end of the superstructure. Her secondary armament consisted of ten 15 cm (5.9 in) SK L/40 guns; four were in single-gun turrets on the upper deck and the remaining six were in casemates in a main-deck battery. For close-range defense against torpedo boats, she carried fourteen 8.8 cm (3.5 in) SK L/35 guns, all in individual mounts in the superstructure and in the hull, either in casemates or open pivot mounts with gun shields. She also had four 45 cm (17.7 in) underwater torpedo tubes, one in the bow, one in the stern, and one on each broadside.[3]

The ship was protected with

amidships and was reduced to 8 cm (3.1 in) on either end. The main battery turrets had 15 cm (5.9 in) thick faces. Her deck was 4–6 cm (1.6–2.4 in) thick, connected to the lower edge of the belt by 4–5 cm (1.6–2.0 in) thick sloped armor.[3]

Service history

Pre-war photo of SMS Roon, most likely taken during 1907 visit to US

Roon was ordered under the provisional name

Kapitän zur See (KzS—Captain at Sea) Fritz Hoffmann. The ship then began sea trials that lasted until 9 July; she joined I Scouting Group on 15 August, where she replaced the armored cruiser Friedrich Carl as the flagship of the deputy commander, KzS and Kommodore (Commodore) Raimund Winkler. Roon then participated in the annual fleet maneuvers held in late August and early September. Later that month, Hoffmann was replaced by Fregattenkapitän (FK—Frigate Captain) Oskar von Platen-Hallermund, who commanded the vessel for just a month before he was in turn relieved by KzS Karl Zimmermann. At the same time as Hoffmann's departure, Winkler also left his post, being replaced by KzS and Kommodore Eugen Kalau vom Hofe, who transferred his flag to Friedrich Carl in October.[6]

She spent the following years participating in training exercises and cruises with the ships of I Scouting Group as well as the entire High Seas Fleet. This routine was interrupted in early 1907 when the ship was sent to the United States to participate in the Jamestown Exposition, which commemorated the 300th anniversary of the arrival of colonists in Chesapeake Bay. Kalau von Hofe returned to Roon to lead the German delegation, which also included the light cruiser Bremen; the two cruisers left Kiel on 8 April and crossed the Atlantic to Hampton Roads, Virginia, arriving on 24 April. Two days later, the international fleet, which also included contingents from Great Britain, Japan, Austria-Hungary, France, Italy, and several other nations, held a naval review as part of the exposition. Following the ceremonies, Bremen was detached to remain on station in the Americas while Roon returned to Germany, arriving back in Kiel on 17 May. On her return, Kalau von Hofe shifted back to Friedrich Carl.[7][8]

Roon sometime before 1914

From 11 September to 28 October, Roon briefly resumed her role as deputy flagship; Friedrich Carl was at that time serving as the group flagship while Roon's sister Yorck was being overhauled. Also in October, FK Friedrich Schrader took command of the ship.[6] The ship went on a major cruise into the Atlantic Ocean from 7 to 28 February 1908 with the other ships of the scouting group. During the cruise, the ships conducted tactical exercises and experimented with using their wireless telegraphy equipment at long distances. They stopped in Vigo, Spain, to replenish their coal for the voyage home.[9] On 5 March, Roon returned to flagship duty, with now Konteradmiral (KAdm—Rear Admiral) Kalau von Hofe back aboard the ship.[7]

Another Atlantic cruise followed in July and August; this time, the cruise was made in company with the battleship squadrons of the High Seas Fleet.

Kaiser Wilhelm Canal to the North Sea, and continued to the Atlantic. The fleet returned to Germany on 13 August. The autumn maneuvers followed from 27 August to 12 September.[10][11] On 23 September, KAdm Jacobsen replaced Kalau von Hofe, and the following month FK Georg Scheidt took command of Roon.[6]

The year 1909 saw two more cruises in the Atlantic, the first in February with just the ships of I Scouting Group and the second in July and August with the rest of the fleet. On the way back to Germany, the fleet stopped in

Kaiser Wilhelm II in September 1911, after which she was decommissioned on 22 September.[7]

World War I

Roon (left) steaming astern of the High Seas Fleet

Following the outbreak of

mobilized for wartime service on 2 August and was initially assigned to II Scouting Group as the flagship of KAdm Gisberth Jasper. The ship's first wartime commander was KzS Johannes von Karpf. A series of reorganizations saw the ship transferred to IV Scouting Group to replace the armored cruiser Blücher and on 25 August IV Scouting Group was renamed III Scouting Group, Roon remaining as flagship. KAdm Hubert von Rebeur-Paschwitz replaced Jasper as the group commander. The following day, Roon and the rest of the group took part in a sortie into the eastern Baltic Sea in a failed attempt to rescue the light cruiser Magdeburg that had run aground in Russian territory. The operation was cancelled on 27 August when Rebeur-Paschwitz received word that Magdeburg had been scuttled to avoid capture by Russian forces.[6]

The group was stationed in the North Sea from 6 September to guard the German coast, interrupted by a short deployment to the Danish straits from 25 to 26 September after false reports of British warships attempting to pass through prompted the German command to send the cruisers on a patrol there. During their period in the North Sea, the cruisers were sent to escort the minelaying cruisers Nautilus and Albatross and the auxiliary minelayer Kaiser as they laid the "Alpha" defensive minefield in the North Sea. The ships then escorted the main body of the High Seas Fleet during the raid on Yarmouth on 2–3 November.[13]

A month later, on 15–16 December, she participated in the

Loftus Jones' destroyers. Jones shadowed Roon for about 45 minutes, at which point Stuttgart and Hamburg were detached to sink their pursuers. Twenty minutes later, Roon signaled the two light cruisers and ordered them to abandon the pursuit and retreat along with the rest of the High Seas Fleet. In the meantime, Vice Admiral David Beatty received word of Roon's location, and in an attempt to intercept the German cruisers, detached the battlecruiser HMS New Zealand to hunt the German ships down, while his other three battlecruisers followed from a distance. While still pursuing the retreating Germans, Beatty had become aware that the German battlecruisers were shelling Hartlepool, so he decided to break off the pursuit of Roon and turn towards the German battlecruisers.[15]

Operations in the Baltic

Map of the North and Baltic Seas in 1911

The German naval command decided that because Roon and the other armored cruisers of the III Scouting Group were slow and lacked thick enough armor, they were unsuitable for service in the North Sea where they would risk contact with the powerful British Grand Fleet.[16] Therefore, on 15 April 1915, Roon and the rest of III Scouting Group were transferred to the Baltic, where they would face the significantly weaker Russian Baltic Fleet. The unit was dissolved and Roon and the other vessels were assigned to the Reconnaissance Forces of the Baltic, under the command of KAdm Albert Hopman. At the same time, FK Hans Gygas replaced Karpf, who in turn became the deputy commander of the unit and made Roon his flagship. On 30 April, the ship went into drydock in Kiel for an overhaul, returning to service for the attack on Libau on 7 May. On 11 May, the British submarine E9 spotted Roon and several other ships en route to Libau, which had been recently captured by the German army. E9 fired five torpedoes at the German flotilla, all of which missed; two passed closely astern of Roon.[17] Roon thereafter took part in a series of sorties into the central Baltic as far north as Gotska Sandön on 13–16 May, 23–26 May, 2–6 June, 11–13 June, and 20–22 June.[18]

Karpf transferred to the light cruiser Lübeck while Hopman relocated to Roon since the latter's flagship, the armored cruiser Prinz Adalbert, was under repairs for a torpedo hit. Roon and Lübeck covered a minelaying operation with Albatross on 30 June that lasted through 2 July and resulted in the Battle of Åland Islands.[19] The light cruiser Augsburg and three destroyers were escorting Albatross when they were attacked by the armored cruisers Bayan, Admiral Makarov, and the light cruisers Bogatyr and Oleg. Augsburg escaped while the destroyers covered the retreat of Albatross, which was severely damaged and forced to seek refuge in neutral Swedish waters.[20] Roon joined Lübeck to relieve the beleaguered German destroyers. Upon arriving at the scene, Roon engaged Bayan, and Lübeck opened fire on Oleg.[20] Shortly thereafter, the Russian cruiser Rurik, along with a destroyer, arrived to reinforce the Russian flotilla. In the following artillery duel, Roon was hit several times, and the German ships were forced to retreat.[21]

Later in July, as the German Army began to push further north from Libau, the naval command reinforced the naval forces in the Baltic to support the advance. The

Sworbe Peninsula. There were several Russian destroyers anchored off Zerel; the German cruisers caught them by surprise and damaged one of them.[19][23]

One of the two Roon-class cruisers

On 9 September, Hopman returned to Prinz Adalbert, allowing Roon to return to Kiel for an overhaul. Work was completed by mid-October and the ship returned to Libau on 18 October. Two days later, Hopman made her his flagship once again. The loss of Prinz Adalbert three days later to a British submarine convinced the German command that the threat of underwater weapons was too serious to continue to operate older vessels with insufficient protection, including Roon. Accordingly, on 15 January 1916, Hopman hauled down his flag, and two days later the ship left Libau to return to Kiel, where she was decommissioned on 4 February.[19]

Fate

In November 1916, Roon was disarmed and converted into a

naval register on 25 November 1920 and scrapped the following year in Kiel-Nordmole.[24][26]

Notes

Footnotes

  1. Seiner Majestät Schiff
    " (German: His Majesty's Ship).
  2. ^ In Imperial German Navy gun nomenclature, "SK" (Schnelladekanone) denotes that the gun is quick loading, while the L/40 denotes the length of the gun. In this case, the L/40 gun is 40 calibers, meaning that the gun is 40 times as long as it is in bore diameter.[5]

Citations

  1. ^ Dodson, pp. 59, 65–66.
  2. ^ Herwig, p. 57.
  3. ^ a b c d Gröner, p. 51.
  4. ^ Dodson, p. 66.
  5. ^ Grießmer, p. 177.
  6. ^ a b c d Hildebrand, Röhr, & Steinmetz Vol. 7, pp. 80–81.
  7. ^ a b c Hildebrand, Röhr, & Steinmetz Vol. 7, p. 81.
  8. ^ Schroeder, pp. 302–303.
  9. ^ Hildebrand, Röhr, & Steinmetz Vol. 8, p. 122.
  10. ^ Hildebrand, Röhr, & Steinmetz Vol. 8, pp. 122–123.
  11. ^ a b Hildebrand, Röhr, & Steinmetz Vol. 2, p. 238.
  12. ^ Hildebrand, Röhr, & Steinmetz Vol. 8, p. 123.
  13. ^ Hildebrand, Röhr, & Steinmetz Vol. 7, pp. 37, 81.
  14. ^ Scheer, p. 69.
  15. ^ Massie, pp. 340–343.
  16. ^ Scheer, p. 135.
  17. ^ Polmar & Noot, p. 40.
  18. ^ Hildebrand, Röhr, & Steinmetz Vol. 7, pp. 80–82.
  19. ^ a b c Hildebrand, Röhr, & Steinmetz Vol. 7, p. 82.
  20. ^ a b Pavlovich, p. 145.
  21. ^ Hart, p. 365.
  22. ^ Halpern, pp. 197–198.
  23. ^ Tucker, pp. 293–294.
  24. ^ a b Gröner, p. 52.
  25. ^ Greger, p. 88.
  26. ^ Campbell & Sieche, p. 142.

References