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Events on Sunday 18 April 1943 1
1884 – 1943Isoroku Yamamoto (1884-1943)Died 18 April 1943, aged 59Isoroku Yamamoto was commander-in-chief of the Imperial Japanese Navy's Combined Fleet and planned the attack on Pearl Harbor. American codebreakers learned his itinerary. US P-38 fighters shot down his aircraft over Bougainville.