Japanese heavy cruiser Chikuma was the second and final vessel of the Tone‑class of heavy cruisers built for the Imperial Japanese Navy (IJN). Named after the Chikuma River in Nagano Prefecture, she was laid down on 1 October 1935 at Mitsubishi’s Nagasaki shipyard, launched on 19 March 1938, and commissioned on 20 May 1939. Chikuma was designed primarily as a long‑range scout cruiser, carrying a large float‑plane complement and the heaviest armor of any Japanese cruiser.
Design and specifications
- Class & type: Tone‑class heavy cruiser
- Displacement: 11,213 t (standard); 15,443 t (full load)
- Dimensions: Length 201.6 m; beam 19.4 m; draught 6.2 m
- Propulsion: Four‑shaft geared turbines powered by eight boilers, delivering 152,000 shp for a top speed of 35 knots; range of 8,000 nmi at 18 knots.
- Armament: Eight 203 mm (8‑in) guns in four twin turrets (all forward of the bridge); eight 127 mm (5‑in) dual‑purpose guns; twelve 610 mm torpedo tubes; multiple 25 mm anti‑aircraft guns.
- Armor: Belt up to 100 mm; deck 65–30 mm.
- Aircraft: Capacity for six floatplanes housed in a dedicated stern hangar.
Operational history
After joining the Second Fleet’s Cruiser Division 6, Chikuma transferred to Cruiser Division 8 in November 1939. Early service included training exercises and patrols off southern China (March 1940 – March 1941). At the outbreak of the Pacific War, she escorted the carrier strike force that attacked Pearl Harbor on 7 December 1941, launching a reconnaissance floatplane alongside her sister ship Tone.
During 1942–1944, Chikuma operated in the Indian Ocean, hunting Allied merchant vessels, and later served as an escort and scout for carrier task forces in major engagements such as the Battle of the Coral Sea, the Battle of Midway, and the Guadalcanal campaign. In October 1944, she participated in the Battle off Samar, part of the larger Battle of Leyte Gulf. Chikuma damaged the U.S. destroyer USS Heermann before being crippled by gunfire from the destroyer escort USS Samuel B. Roberts and subsequently sunk by aircraft attacks on 25 October 1944.
Fate
The cruiser was officially stricken from the IJN register on 20 April 1945. Her loss, together with that of other Japanese heavy cruisers, marked the diminishing capability of the Imperial Japanese Navy’s surface fleet in the final months of World War II.