Attack on Pearl Harbor
Planning for an attack on Pearl Harbor had been planned since early 1941. Isoroku Yamamoto came up with the plan in order to protect Japan's attack on Southern Asia. He got permission to plan and train for an attack. To do so, he had to argue with the Imperial Japanese Navy General Staff. He only got permission because he threatened to quit his job. Full-scale planning started in Spring 1941. The planning was under the guidance of  Rear Admiral Ryūnosuke Kusaka, with assistance from Captain Minoru Genda. The planners looked to the 1940 British air attack on the Italian fleet at Taranto for help. This was because the British had successfully attacked ships in port there.