Japanese cruiser Agano

Coordinates: 10°11′N 151°42′E / 10.183°N 151.700°E / 10.183; 151.700
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Sasebo
, October 1942
History
Empire of Japan
NameAgano
NamesakeAgano River
Ordered1939 Fiscal Year
BuilderSasebo Naval Arsenal
Laid down18 June 1940
Launched22 October 1941
Commissioned31 October 1942
Stricken31 March 1944
FateSunk by USS Skate, 15 February 1944
General characteristics (as built)
Class and typeAgano-class light cruiser
Displacement
Length174.1 m (571 ft 2 in) (
o/a
)
Beam15.2 m (49 ft 10 in)
Draft5.63 m (18 ft 6 in)
Installed power
Propulsion4 shafts; 4 geared steam turbine sets
Speed35 knots (65 km/h; 40 mph)
Range6,300 nmi (11,700 km; 7,200 mi) at 18 knots (33 km/h; 21 mph)
Complement51 officers, 649 sailors; 57 and 669 when serving as a flagship
Sensors and
processing systems
Armament
Armor
  • Belt 60 mm (2.4 in)
  • Deck 20 mm (0.8 in)
Aircraft carried2 × floatplanes
Aviation facilities1 × aircraft catapult

Agano (阿賀野) was the lead ship of her class of four light cruisers built for the Imperial Japanese Navy (IJN) during World War II. Completed in 1942, she escorted a troop convoy to New Guinea in December. In early 1943 the ship participated in Operation Ke, the evacuation of Japanese troops from Guadalcanal. Six months later Agano transported troops and supplies to New Guinea and she played a role in the Battle of Empress Augusta Bay in early November where she damaged the destroyer USS Spence. A few weeks later, the ship was badly damaged by American airstrikes and she sailed for Truk under her own power the following day. While en route, Agano was torpedoed by an American submarine and had to be towed to her destination. After several months of repairs, she left for Japan, but was intercepted and sunk by another American submarine in February 1944. Most of her crew was rescued by her escorting destroyer, but that ship was sunk with the loss of most of her crew and all of Agano's survivors by an American airstrike the following day.

Design and description

The Agano-class ships were intended to replace the obsolete light cruisers built in the 1910s and 1920s as

deep load.[1] The ships had a crew of 51 officers and 649 enlisted men; assignment as a flagship added 6 officers and 20 more sailors.[2]

The Agano class had four geared

Kampon Ro Gō water-tube boilers. The turbines were designed to produce a total of 100,000 shaft horsepower (75,000 kW) and give the ships a speed of 35 knots (65 km/h; 40 mph). The ships carried enough fuel oil to give them a range of 6,300 nautical miles (11,700 km; 7,200 mi) at a speed of 18 knots (33 km/h; 21 mph).[3]

Armament and protection

The main armament of the Agano class consisted of six

anti-aircraft machineguns. The ships also had two rotating quadruple torpedo launchers on the upper deck for Type 93 61-centimeter (24 in) (Long Lance) torpedoes on the centerline and had a reload system with eight spare torpedoes. The Agano-class ships were also fitted with a pair of Aichi E13A floatplanes and a catapult.[5] To detect submarines, the Aganos were equipped with a Type 93 Model 2 hydrophone installation and a Type 93 Model 3 sonar. They were equipped with two depth charge chutes for 18 depth charges and could also carry three mines.[6]

The propulsion machinery was protected by a waterline armor belt 60 millimeters (2.4 in) thick with 20-millimeter (0.8 in) transverse bulkheads fore and aft of the propulsion machinery and a middle deck of the same thickness. The ships' magazines were enclosed in armored boxes with 55-millimeter (2.2 in) sides, 20-millimeter tops and 20- or 25-millimeter ends.[7]

Construction and career

Agano, named for the

Susumu Kimura hoisted his flag aboard her the following day.[9] On 16 December Agano escorted the aircraft carrier Jun'yō and a troop convoy to Wewak and Madang in New Guinea. The ships briefly covered the landing of Japanese forces at Hollandia before returning to Truk on 20 December.[10]

Agano escorted the forces covering the evacuation of Japanese troops from Guadalcanal Island (Operation KE) from 31 January to 9 February 1943, during which 11,700 Japanese soldiers were removed.

American offensive in the Aleutian Islands, but this operation was cancelled after the Allied victory on Attu on 29 May. Agano was refitted at the Kure Naval Arsenal from 3 June to 2 July. The ship exchanged her 13.2 mm machine guns for a pair of twin-gun Type 96 mounts and another pair of triple 25 mm mounts were added amidships, giving her a total of sixteen 25 mm guns. A Type 21 early-warning radar was also installed.[11]

Agano departed for Truk on 9 July escorting the

Eniwetok to search for the American forces before they returned to Truk on 23 September, having failed to locate them. The Japanese had intercepted some American radio traffic that suggested another attack on Wake Island, and on 17 October, Agano and the bulk of the fleet sailed for Eniwetok to be in a position to intercept any such attack, but no attack occurred and the fleet returned to Truk.[10]

Battle of Empress Augusta Bay

Main article: Battle of Empress Augusta Bay
A map of Bougainville

The ship, now the flagship of Rear Admiral Morikazu Osugi, departed Truk on 30 October for Rabaul just as the Americans were preparing to invade Bougainville Island on 1 November. The Japanese attempted to disrupt the landings on the night of 1/2 November with a force of two heavy cruisers, two light cruisers, including Agano, and six destroyers under the command of Rear Admiral Sentarō Ōmori. The Japanese ships had been spotted by American aircraft around 21:00 and Task Force 39, which consisted of four light cruisers and eight destroyers, was ordered to intercept them.[12]

Omori arranged his ships in three staggered columns; the outer ones were each led by one of the light cruisers followed by three destroyers and the two heavy cruisers were in the middle. Osugi in Agano led the southernmost column, which trailed the main body. One of the cruiser floatplanes claimed to have spotted a cruiser and three destroyers 20 nmi (37 km; 23 mi) south at 01:20 and Ōmori ordered his ships to make a 180-degree maneuver intended to buy time for the pilot to investigate Empress Augusta Bay for American shipping. Less than an hour later, he reported that American transports crowded the bay; the pilot had actually spotted three minelayers and their destroyer escort that were leaving the bay. Omori ordered his ships to reverse course at 02:25. In the darkness, and with most ships lacking radar, the Japanese formation of three columns was disordered by the maneuvers and commanders lost track of where their ships were in relation to each other.[13]

American radar picked up the Japanese at a range of 36,000 yards (33,000 m) at 02:27 and Rear Admiral Aaron Merrill, commander of the task force, ordered his destroyers to attack with their torpedoes while his cruisers stood off to avoid Japanese torpedoes and would open fire when the torpedoes struck their targets to maintain the element of surprise. The leading division of four destroyers fired a salvo of 25 torpedoes by 02:46, but they were detected as they turned away and the Japanese turned into the torpedoes to makes themselves smaller targets. Their maneuvering caused Merrill to believe that his ships had been spotted and the first of his cruisers opened fire at the light cruiser Sendai, leading the northernmost column, three minutes later.[14]

The abrupt maneuvers by the Japanese ships, both to evade the American torpedoes and to fire their own, led to one collision and several near misses early in the battle. Most of the American cruisers were firing at the heavy cruisers in the center column by 03:05 and Omori turned away in a 270-degree turn that cut across the path of Agano's column. The heavy cruiser Myōkō rammed and crippled the destroyer Hatsukaze while the heavy cruiser Haguro nearly struck the destroyer Wakatsuki. Incorrectly believing that he had sunk three of the American cruisers, Omori ordered his ships to cease fire at 03:29 and turned away to disengage four minutes later. Osugi, who had kept his ships on the disengaged side of the heavy cruisers after the collision, fired a parting shot of eight torpedoes at 03:40, all of which missed.[15]

For her part of the engagement, Agano hit the destroyer USS Spence with a 6-inch (152 mm) shell which landed below the waterline, causing minor flooding. However, the damage was not significant as the shell failed to explode.[16]

After returning to Rabaul, Agano was near-missed by a bomb when the aircraft carriers

Task Group 50.2 attacked Rabaul. Agano was hit by a Mark 13 torpedo which blew off the very end of her stern and bent her rearmost propeller shafts. The ship's rudder was not damaged, although Osugi was injured in the attack. After emergency repairs were made by the ship's crew, Agano departed Rabaul under her own power the next day, escorted by the destroyer Urakaze. Not long after their departure, the ships were sighted by the American submarine USS Scamp, which launched six torpedoes. One of them struck the cruiser amidships, flooding all of the boiler rooms, which knocked out all power. While attempting to repair the damage, the submarine Albacore attempted to attack, but was prevented from doing so by depth charges from Urakaze. Noshiro and the light cruiser Nagara were ordered to her assistance on the 13th and her sister took Agano in tow upon her arrival. The tow parted the following day and Nagara took over the task. The damaged ship finally reached Truk on 16 November.[17]

Sinking

Temporary repairs by the repair ship

navy list on 31 March.[18]

As Oite was approaching Truk the following morning, the destroyer was sunk by

Task Force 58 in the course of Operation Hailstone, and sank within minutes, taking all but twenty of her own crew down with her. All of the Agano crewmembers originally rescued were lost.[10]

Notes

  1. ^ a b Whitley, p. 186
  2. ^ Lacroix & Wells, p. 591
  3. ^ Jentschura, Jung & Mickel, p. 111
  4. ^ Stille, pp. 35–36
  5. ^ Lacroix & Wells, pp. 571–72, 579–580
  6. ^ Lacroix & Wells, pp. 579–581
  7. ^ Lacroix & Wells, pp. 563–564
  8. ^ Lacroix & Wells, p. 562
  9. ^ Lacroix & Wells, pp. 593–594
  10. ^ a b c d Hackett & Kingsepp
  11. ^ Lacroix & Wells, p. 594
  12. ^ O'Hara, pp. 206–207
  13. ^ O'Hara, pp. 207, 209–210
  14. ^ O'Hara, pp. 210–211
  15. ^ O'Hara, pp. 211–214
  16. ^ "Spence (DD-512)". NHHC. Retrieved 9 May 2024.
  17. ^ Lacroix & Wells, p. 595
  18. ^ Lacroix & Wells, pp. 595–596

References

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