Mezue ahịrịokwu na-esonụ: Atụmatụ mbụ maka ịwakpo Pearl Harbor iji chebe ịkwaga na "Southern Resource Area" (okwu Japanese maka Dutch East Indies na Ndịda Ebe Ọwụwa Anyanwụ Eshia n'ozuzu) amalitela n'oge na-adịghị anya na 1941 n'okpuru nkwado nke Admiral Isoroku Yamamoto, mgbe ahụ na-achịkwa ndị Japan jikọtara ụgbọ mmiri. O nwetara nkwenye maka nhazi na ọzụzụ maka mwakpo site na Imperial Japanese Navy General Staff naanị mgbe esemokwu dị ukwuu na isi ụlọ ọrụ Naval, gụnyere iyi egwu ịhapụ ọrụ ya. Atụmatụ zuru oke na-aga n'ihu site na mmalite oge opupu ihe ubi nke 1941, nke bụ Rear Admiral Ryūnosuke Kusaka, na enyemaka nke Captain Minoru Genda na Yamamoto's Deputy Chief of Staff, Captain Kameto Kuroshima. Ndị na-eme atụmatụ na-amụ ihe
N'afọ 1940, ndị Briten ji ụgbọelu ha wakpo ndị Itali n'obodo Taranto.