:Japanese cruiser Agano

The Agano-class ships were intended to replace the obsolete light cruisers built in the 1910s and 1920s as flagships of destroyer flotillas. The ships measured {{convert|174.1|m|ftin|sp=us}} long overall with a beam of {{convert|15.2|m|ftin|sp=us}} and had a draft of {{convert|5.63|m|ftin|sp=us}}. They displaced {{convert|6652|t|LT|0|sp=us|lk=on}} at standard load and {{convert|8534|t|LT|0|sp=us}} at deep load.Whitley, p. 186 The ships had a crew of 51 officers and 649 enlisted men; assignment as a flagship added 6 officers and 20 more sailors.Lacroix & Wells, p. 591

The Agano class had four geared steam turbine sets, each driving a single propeller shaft, using steam provided by six Kampon Ro Gō water-tube boilers. The turbines were designed to produce a total of {{convert|100000|shp|lk=in}} and give the ships a speed of {{convert|35|kn|lk=in}}. The ships carried enough fuel oil to give them a range of {{convert|6300|nmi|lk=in}} at a speed of {{convert|18|kn}}.Jentschura, Jung & Mickel, p. 111

The main armament of the Agano class consisted of six 15 cm/50 41st Year Type in three twin-gun turrets, two superfiring in front of the superstructure and one aft. The secondary armament included four Type 98 8 cm (3 in) anti-aircraft (AA) guns in two twin-gun mounts amidships.Stille, pp. 35–36 The suite of light anti-aircraft weapons included a pair of triple mounts for Type 96 25 mm AT/AA Gun AA guns and two twin-gun mounts for Hotchkiss M1929 machine gun anti-aircraft machineguns. The ships also had two rotating quadruple torpedo launchers on the upper deck for Type 93 torpedo 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.Lacroix & Wells, pp. 571–72, 579–580 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.Lacroix & Wells, pp. 579–581

The propulsion machinery was protected by a waterline armor belt {{convert|60|mm|sp=us}} thick with {{convert|20|mm|1|sp=us|adj=on}} 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 {{convert|55|mm|sp=us|adj=on}} sides, 20-millimeter tops and 20- or 25-millimeter ends.Lacroix & Wells, pp. 563–564

Agano, named for the Agano River,Lacroix & Wells, p. 562 was laid down at Sasebo Naval Arsenal on 18 June 1940, launched on 22 October 1941 and completed on 31 October 1942. She was assigned as flagship of Destroyer Squadron 10 ({{lang|ja|Sentai 10}}) of the Third Fleet on 20 November after working up. The ship departed Kure six days later and arrived at Truk in the Caroline Islands on 1 December where Rear Admiral Susumu Kimura hoisted his flag aboard her the following day.Lacroix & Wells, pp. 593–594 On 16 December Agano escorted the aircraft carrier {{ship|Japanese aircraft carrier|Jun'yō||2}} 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.

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.Hackett & Kingsepp The ship was transferred to the 1st Mobile Fleet the following day. She returned to Kure Naval District in early May for her sea trials and was then assigned to the Combined Fleet preparing to counterattack the 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.Lacroix & Wells, p. 594

Agano departed for Truk on 9 July escorting the First Carrier Division while carrying troops and supplies. Despite numerous sightings by American submarines and an attack on the aircraft carrier {{ship|Japanese aircraft carrier|Zuihō||2}}, the convoy made it safely to Truk on the 15th. Agano helped to ferry troops and supplies to Rabaul on 19–26 July. In response to the American carrier raid on Tarawa on 18 September, the ship and much of the fleet sortied for 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.

{{main|Battle of Empress Augusta Bay}}

File:Bougainville campaign 1945.jpg

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.O'Hara, pp. 206–207

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 {{cvt|20|nmi}} 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.O'Hara, pp. 207, 209–210

American radar picked up the Japanese at a range of {{convert|36000|yd|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 {{ship|Japanese cruiser|Sendai||2}}, leading the northernmost column, three minutes later.O'Hara, pp. 210–211

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 {{ship|Japanese cruiser|Myōkō||2}} rammed and crippled the destroyer {{ship|Japanese destroyer|Hatsukaze||2}} while the heavy cruiser {{ship|Japanese cruiser|Haguro||2}} nearly struck the destroyer {{ship|Japanese destroyer|Wakatsuki||2}}. 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.O'Hara, pp. 211–214

After returning to Rabaul, Agano was near-missed by a bomb when the aircraft carriers {{USS|Saratoga|CV-3|6}} and {{USS|Princeton|CVL-23|6}} attacked the port on 5 November. The bomb damaged one anti-aircraft gun and killed one crewman. Agano and her sister {{ship|Japanese cruiser|Noshiro||2}} put to sea on the following day to destroy the American forces near Empress Augusta Bay, but this was cancelled and the ships returned to Rabaul on 7 November. Four days later, the American aircraft carriers of 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 {{ship|Japanese destroyer|Urakaze|1940|2}}. Not long after their departure, the ships were sighted by the American submarine {{USS|Scamp|SS-277|6}}, 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 {{USS|Albacore|SS-218|2}} attempted to attack, but was prevented from doing so by depth charges from Urakaze. Noshiro and the light cruiser {{ship|Japanese cruiser|Nagara||2}} 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.Lacroix & Wells, p. 595

Temporary repairs by the repair ship {{ship|Japanese repair ship|Akashi||2}} began immediately upon her arrival and lasted until 15 February 1944. That evening she departed Truk to get permanent repairs in the Japanese home islands, escorted by the destroyer {{ship|Japanese destroyer|Oite|1924|2}} and submarine chaser CH-28. On the afternoon of 16 February, about {{convert|160|nmi|km}} north of Truk, Agano was attacked by the submarine {{USS|Skate|SS-305|2}}, which fired four torpedoes. Two struck the cruiser on the starboard side at 16:44, flooding Boiler Room No. 2 which gave her a list of 12° and started a large fire. The ship progressively flooded and Oite rescued 523 survivors between 20:00 and 23:30. Agano sank at {{coord|10|11|N|151|42|E|display=inline, title}} at 01:50 on 17 February and was struck from the navy list on 31 March.Lacroix & Wells, pp. 595–596

As Oite was approaching Truk the following morning, the destroyer was sunk by Grumman TBF Avengers of 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.

{{reflist}}

• {{cite book| last1 = Jentschura| first1 = Hansgeorg| first2 = Dieter |last2=Jung|first3=Peter |last3=Mickel| year = 1977| title = Warships of the Imperial Japanese Navy, 1869–1945| publisher = United States Naval Institute| location = Annapolis, Maryland| isbn = 0-87021-893-X|name-list-style=amp}}
• {{cite book|last1=Lacroix|first1=Eric|last2=Wells II|first2=Linton |title=Japanese Cruisers of the Pacific War|publisher=Naval Institute Press|location=Annapolis, Maryland|date=1997|isbn=0-87021-311-3 |name-list-style=amp |author-link2=Linton Wells II}}
• {{cite book | last = O'Hara | first = Vincent P.| year = 2007 | title = The U.S. Navy Against the Axis: Surface Combat 1941-1945 | publisher = Naval Institute Press | location = Annapolis, Maryland| isbn = 978-1-59114-650-6 }}
• {{cite book | last = Stille | first = Mark | year = 2012 | title = Imperial Japanese Navy Light Cruisers 1941-45| publisher = Osprey | location =Botley, UK | isbn = 978-1-84908-562-5 }}
• {{cite book | last = Whitley | first = M. J. | author-link =Michael J. Whitley | year = 1995 | title = Cruisers of World War Two: An International Encyclopedia | publisher = Naval Institute Press | location = Annapolis, Maryland| isbn = 1-55750-141-6 }}

{{Agano class cruiser}}

{{February 1944 shipwrecks}}

{{DEFAULTSORT:Agano}}

Category:Agano-class cruisers

Category:Ships built by Sasebo Naval Arsenal

Category:1941 ships

Category:World War II cruisers of Japan

Category:Ships sunk by American submarines

Category:World War II shipwrecks in the Pacific Ocean

Category:Warships lost with all hands

Category:Maritime incidents in February 1944