Isuzu (cruiser)

Isuzu (cruiser) was a light cruiser of the Imperial Japanese Navy, the fifth and final vessel of the . Commissioned in the interwar period, she served extensively during the Pacific War, initially in surface combat roles before being converted into a dedicated anti-aircraft cruiser. Her long career saw action in major campaigns from the Dutch East Indies campaign to the Solomon Islands campaign, ultimately ending with her sinking by United States Navy submarines in 1945.

Design and description

The *Nagara*-class cruisers were developed as improved versions of the preceding , intended for both fleet reconnaissance and as flagships for destroyer or submarine flotillas. Their design emphasized high speed and a powerful torpedo armament, conforming to Japanese naval doctrine of the period. Standard displacement was 5,570 long tons, with a length of 162.15 meters and a beam of 14.17 meters. Propulsion was provided by twelve Kampon boilers driving four Gihon geared turbine sets, generating 90,000 shaft horsepower for a top speed of 36 knots. Armor protection was light, with a 63 mm waterline belt and a 28.6 mm armored deck. As built, her main armament consisted of seven single-mounted 14 cm/50 3rd Year Type naval guns and two 8 cm/40 3rd Year Type naval guns for anti-aircraft defense. The class was also notable for its heavy torpedo battery of eight 61 cm tubes in four twin mounts and the capability to carry one floatplane, launched from a forward aircraft catapult.

Construction and career

*Isuzu* was ordered under the 1920 Fiscal Year as part of the Eight-eight fleet expansion plan. Her keel was laid down on 10 August 1920 at the Uraga Dock Company shipyard in Uraga. She was launched on 29 October 1921 and commissioned into the Imperial Japanese Navy on 15 August 1923. Following commissioning, she was assigned to various fleet duties, including patrols along the coast of China and participation in annual Combined Fleet maneuvers. In the late 1930s, she underwent several minor refits, which included upgrades to her anti-aircraft armament and the installation of improved fire-control directors in preparation for the escalating conflict.

Service history

At the start of the Pacific War, *Isuzu* was part of the invasion force for the Dutch East Indies campaign, providing cover for landings at Tarakan, Balikpapan, and Java. She participated in the Battle of the Java Sea in February 1942. Later that year, she was deployed to the Solomon Islands campaign, engaging in the Battle of the Eastern Solomons and the Battle of the Santa Cruz Islands as part of carrier screening forces. In 1943, she was damaged during the Battle of Kolombangara and subsequently returned to Japan for a major reconstruction. This 1944 conversion transformed her into an anti-aircraft cruiser: her aft guns and torpedo tubes were removed and replaced with three twin mounts for the new 10 cm/65 Type 98 naval gun, and she received a significant battery of Type 96 25mm AT/AA Guns. In her new role, she was primarily tasked with escorting convoys and fleet units, including the super-battleships and .

Fate

While escorting a convoy from Surabaya to Makassar on 7 April 1945, *Isuzu* was attacked by the United States Navy submarines and in the Java Sea near Sumbawa. Struck by multiple torpedoes, the cruiser sank quickly at position 07°38′S 118°09′E. The destroyer rescued 190 survivors, but approximately 450 crewmen, including her captain, were lost. *Isuzu* was removed from the Navy List on 20 June 1945.

Notes

Category:Nagara-class cruisers Category:Ships built by Uraga Dock Company Category:World War II cruisers of Japan Category:Ships sunk by American submarines in World War II Category:1921 ships