Japanese aircraft carrier Hiryu

Japanese aircraft carrier Hiryu was a Sōryū-class aircraft carrier built for the Imperial Japanese Navy during the 1930s. As the second and improved unit of her class, she was a key component of the Kido Butai, the Imperial Japanese Navy Air Service's elite carrier striking force. Hiryū participated in several major early campaigns of the Pacific War, including the attack on Pearl Harbor and the Indian Ocean raid, before being sunk at the pivotal Battle of Midway.

Design and construction

Hiryū was ordered in 1934 under the Second Naval Armaments Supplement Programme as an improved follow-on to her sister ship, Sōryū. Her design, overseen by constructor Kikuo Fujimoto, incorporated lessons from the earlier Ryūjō and the Washington Naval Treaty era, resulting in a larger, more stable hull with an island superstructure placed on the port side, an unusual arrangement intended to facilitate simultaneous flight operations with her starboard-side sister. Constructed at the Yokosuka Naval Arsenal, her keel was laid down on 8 July 1936, she was launched on 16 November 1937, and commissioned into service on 5 July 1939. Key features included a high-speed machinery plant capable of 34.5 knots, enhanced anti-aircraft armament, and improved aviation facilities to operate a larger air group.

Service history

Upon commissioning, Hiryū was assigned to the Second Carrier Division and participated in the Second Sino-Japanese War, conducting air operations over China. At the start of the Pacific War, as part of the Kido Butai under Vice Admiral Chuichi Nagumo, she launched aircraft for the attack on Pearl Harbor on 7 December 1941. In early 1942, she took part in the conquest of the Dutch East Indies, supported the Bombing of Darwin, and joined the Indian Ocean raid, striking targets at Colombo and Trincomalee in Ceylon and contributing to the sinking of the British aircraft carrier HMS ''Hermes''. She was then dispatched for the critical Operation MI, the planned invasion of Midway Atoll.

Aircraft and air group

At the time of Midway, Hiryū's air group, part of Carrier Division 2, consisted of 21 Mitsubishi A6M Zero fighters, 21 Aichi D3A "Val" dive bombers, and 21 Nakajima B5N "Kate" torpedo bombers. This standardized complement mirrored that of other front-line Japanese carriers like Akagi and Kaga. The air group was highly experienced, with veterans of Pearl Harbor and the Indian Ocean, and was commanded by air officer Captain Kaku Tomeo. Her fighters were instrumental in defending the Kido Butai during the early stages of the Battle of Midway.

Fate and wreck

During the Battle of Midway on 4 June 1942, Hiryū was the only Japanese carrier to survive the initial devastating attacks by United States Navy SBD Dauntless dive bombers from USS ''Enterprise'' and USS ''Yorktown'', which crippled Akagi, Kaga, and Sōryū. Hiryū immediately launched counterstrikes that ultimately disabled USS ''Yorktown''. However, in the late afternoon, she was located and attacked by dive bombers from USS ''Enterprise''. Hit by four 1,000-pound bombs, her flight deck was wrecked and severe fires ignited among fueled and armed aircraft. Despite heroic damage control efforts led by Captain Tomeo Kaku, the fires became uncontrollable. The crew was evacuated and the ship was scuttled by torpedoes from the escorting destroyers ''Makigumo'' and ''Kazagumo'' early on 5 June. Her wreck was located in 1999 by Nauticos and United States Navy personnel.

Legacy

The loss of Hiryū and the three other carriers at Midway was a catastrophic and decisive strategic defeat for Japan, permanently crippling the offensive capability of the Kido Butai and shifting the initiative in the Pacific War to the Allies. Hiryū is remembered for the tenacity of her crew and air group, who launched effective strikes even as the battle turned against them. The battle is extensively studied at institutions like the United States Naval War College and memorialized in numerous works, including the film Midway. Her design innovations influenced subsequent Japanese carrier construction, including the ''Taihō'' and the Unryū-class.

Category:Aircraft carriers of the Imperial Japanese Navy Category:Ships sunk in the Battle of Midway Category:World War II shipwrecks in the Pacific Ocean