The Agano-class cruisers were designed as agile flagships but lacked heavy defensive armor protection.

Countries & Cities · Published 15 October 2026 Swipe more like this →

In short: Intended to lead destroyer and submarine squadrons, the four Agano-class cruisers were fast and stable vessels that served throughout the Pacific War. Despite their graceful design and powerful torpedo armament, these light cruisers were under-gunned and lightly protected, leading to a difficult combat history for most of the class.

The Imperial Japanese Navy conceived the Agano class to replace aging cruisers from the Tenryū, Kuma, and Nagara classes. Originally, the design was meant to feature nine 155mm guns in triple turrets, but these proved too heavy for the ships. Engineers eventually settled on a main battery of six 15-centimeter guns in three twin turrets. To compensate for the reduced gun power, the navy prioritized offensive torpedo capabilities, equipping each vessel with two quadruple launchers for Type 93 Long Lance torpedoes, supported by a reload system containing eight additional torpedoes.

Construction was finalized in October 1937, though shipyard delays pushed completion into the war years. Each ship cost 16.4 million yen to build. Unlike many contemporary Japanese designs, the Agano class was not overweight, which provided excellent stability and seaworthiness. However, protection was minimal; the machinery was shielded by a 60-millimeter waterline armor belt, and the magazines were enclosed in armored boxes. This lack of robust protection made them vulnerable during the intense naval engagements of the 1940s.

The operational lives of the four ships were brief and often tragic. The Agano was sunk by the submarine USS Skate in February 1944, while the Noshiro was lost to aircraft during the Battle of Leyte Gulf in October 1944. The Yahagi met its end in April 1945, hit by seven torpedoes and a dozen bombs while accompanying the battleship Yamato on a final mission. Only the Sakawa survived the conflict, eventually being expended in the 1946 atomic bomb tests at Bikini Atoll.

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