 In August 1939, the United States imposes a trade embargo on a belligerent Japan, severely limiting raw materials.Influential army figures and politicians push through an alliance with Germany and Italy in September 1940 and prepare for war.The newly appointed Commander-in-Chief of the Combined Fleet, Admiral Isoroku Yamamoto, reluctantly plans a pre-emptive strike on the U.S. Pacific Fleet anchored at Pearl Harbor, believing that Japan's best hope of controlling the Pacific Ocean is to quickly annihilate the American fleet.