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| Hiryu (carrier) | |
|---|---|
| Ship name | Hiryu |
| Caption | Imperial Japanese Navy aircraft carrier Hiryu underway in 1939 |
| Ship namesake | Flying Dragon |
| Ship builder | Yokosuka Naval Arsenal |
| Ship launched | 1937 |
| Ship completed | 1939 |
| Ship decommissioned | 1942 (sunk) |
| Ship displacement | 20,000 tons (standard) |
| Ship length | 227 m |
| Ship propulsion | Steam turbines |
| Ship speed | 34 knots |
| Ship aircraft | 72 aircraft (planned) |
| Ship armament | 8 × 127 mm, 16 × 25 mm AA |
Hiryu (carrier) was an Imperial Japanese Navy aircraft carrier that served during the Second Sino-Japanese War and the early years of the Pacific War. Commissioned in 1939, she participated in major operations including the Attack on Pearl Harbor, the Indian Ocean raid, and the Battle of Midway. Hiryu was sunk during the Battle of Midway in June 1942, becoming one of the most studied carriers in analyses of naval aviation, island-hopping campaign strategy, and carrier warfare.
Hiryu was designed under the Washington Naval Treaty constraints alongside sister ships in the Soryu-class aircraft carrier program, drawing on lessons from HMS Hermes and the USS Langley conversions and influenced by prewar doctrine at the Kantai Kessen planning offices. Built at Yokosuka Naval Arsenal with hull and flight-deck innovations derived from the Kaga (aircraft carrier) and Akagi (aircraft carrier), Hiryu featured a unique two-island flight deck concept in preliminary designs revised to a single island to improve air operations, reflecting developments at the Naval Staff College (Japan). Her propulsion plant was based on high-pressure boilers and geared steam turbines comparable to contemporary units ordered by the Royal Navy and United States Navy yards, enabling sustained speeds similar to HMS Ark Royal and USS Enterprise (CV-6).
The carrier's air group composition was intended to integrate carrier-based Mitsubishi A6M Zero, Nakajima B5N "Kate", and Aichi D3A "Val" types, aligning with tactical doctrines promoted by figures at the Imperial Japanese Naval Academy and the Combined Fleet. Armor, hangar arrangement, and fuel storage reflected design trade-offs debated during staff discussions with officers who had participated in the Shanghai Incident operations.
Hiryu joined the Combined Fleet and took part in fleet exercises with Admiral Isoroku Yamamoto's carrier strike force, contributing to early carrier tactics tested against units from the Third Fleet and First Air Fleet. During the Attack on Pearl Harbor, Hiryu's aircraft were assigned missions coordinated with the Kido Butai group alongside Akagi, Kaga, Soryu, and Shokaku. After operations in the Philippines campaign (1941–1942), she supported the Dutch East Indies campaign and the Indian Ocean raid under the overall command of officers who had fought in Russo-Japanese War-era planning circles and later wrote memoirs in conjunction with staff from the Imperial Japanese Navy General Staff.
Throughout 1942 Hiryu conducted strike operations, anti-shipping sorties, and air defense patrols, often coordinating with surface units such as the Kongō-class battleships and cruiser divisions including commanders from the Fourth Fleet (Imperial Japanese Navy). Her air group adapted to losses and replacements from training units at the Yokosuka Naval Air Group and other naval aviation bases on Kyushu and Okinawa Prefecture islands.
Hiryu participated in the Attack on Pearl Harbor, contributing dive-bomber and torpedo-bomber sorties that complemented strikes from Akagi and Soryu. In the Indian Ocean raid (1942), Hiryu's aircraft struck targets in the British Eastern Fleet areas around Ceylon and Colombo, interacting operationally with carrier elements from the Royal Navy and responses by admirals who had served under James Somerville. At the Battle of Midway, Hiryu launched the last effective coordinated strike from the Japanese carriers that temporarily crippled USS Yorktown (CV-5), demonstrating effective pilot training from Tokorozawa Air Group and tactical lessons learned since Pearl Harbor.
Her air group missions across these battles linked to ship movements charted by staff officers who had earlier served aboard cruisers during the Second Sino-Japanese War and used intelligence produced by codebreakers at Station Hypo and signals analyses later associated with FRUMEL and MAGNUM.
During the Battle of Midway on 4–5 June 1942, Hiryu was attacked by aircraft from USS Enterprise (CV-6), USS Hornet (CV-8), and USS Yorktown (CV-5) in a series of strikes coordinated by commanders in the United States Pacific Fleet and intelligence analysts at OP-20-G. After sustaining multiple bomb hits and uncontrollable fires fed by aviation fuel and bomb magazines, damage-control teams drawn from protocols developed at the Kure Naval Arsenal were overwhelmed. Fires led to fatal structural damage and, after the crew abandoned ship, Hiryu sank northeast of Midway Atoll. The sinking contributed to the loss of four Japanese fleet carriers at Midway, a turning point cited by historians from institutions like the Naval War College and authors associated with United States Naval Institute publications.
Survivor testimonies from Hiryu's crew were recorded in postwar interviews conducted by investigators from the Allied Occupation of Japan and by Japanese veterans' organizations linked to memoirs published by former officers who had been students at the Imperial Japanese Naval Academy. Accounts detail damage-control efforts, pilot and deck-crew experiences during repeated launches and recoveries, and the abandonment process ordered by captains whose careers had included service in the Second Sino-Japanese War and engagement with staff at the Combined Fleet headquarters. American intelligence reports and interrogations of survivors aided analyses preserved in archives at the National Archives and Records Administration and referenced in studies by historians affiliated with the Smithsonian Institution and Monterey Institute.
Hiryu's loss at Midway is cited in works by scholars from the Naval Historical Center and authors publishing with the United States Naval Institute Press as a pivotal moment in carrier warfare, influencing postwar doctrines studied at the Naval Postgraduate School and United States Naval Academy. Memorials and underwater surveys by expeditions sponsored by institutions like the National Oceanic and Atmospheric Administration and private research teams have documented the wreck site near Midway Atoll National Wildlife Refuge, contributing to heritage discussions involving the Ministry of Foreign Affairs (Japan) and preservation groups associated with the World War II Valor in the Pacific National Monument. Hiryu appears in cultural works, academic analyses, and museum exhibits at institutions such as the Yasukuni Shrine archives and maritime museums in Kure and Yokosuka, reflecting ongoing study of Imperial Japanese Navy carrier design, operational doctrine, and the human cost of Pacific naval battles.
Category:Aircraft carriers of the Imperial Japanese Navy Category:Ships sunk at the Battle of Midway