Kaga began as a Tosa class battleship, and was launched on 17 November 1921 at the Kawasaki Heavy Industries shipyard in Kobe. On 5 February 1922 both Tosa class ships were cancelled and designated for scrapping under the terms of the Washington Naval Treaty.At the beginning of World War II, Kaga was commanded by Captain Okada Jisaku. Together with Akagi she formed Carrier Division 1 of the Striking Force for the attack on Pearl Harbor. On 7 December 1941 she launched two strikes against Oahu. In her first strike, 26 Nakajima B5N "Kate" torpedo bombers targeted Arizona, Vestal, Tennessee, West Virginia, Oklahoma, and Nevada, and 9 Mitsubishi A6M "Zero" fighters attacked the airbase at Hickam Field. In her second strike, 23 Aichi D3A "Val" dive bombers targeted Nevada, Maryland, and West Virginia.
In May 1942, Kaga sailed on her final mission. Her aircraft complement was 30 Zeros,23 Vals,and 30 Kates.On 4 June 1942 Kaga launched air strikes against Midway, and then came under attack from American land- and carrier-based planes. At 10:22, SBD Dauntless dive-bombers from USS Enterprise hit her with at least four 1000 lb (453.6 kg) bombs, which set off explosions and fires among the armed and fueled planes on her hangar deck. Captain Okada was killed by a bomb that hit the bridge. The fires proved impossible to control and the order to abandon ship was given at about 14:00.
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