Whakaotihia te rerenga e whai ake nei: Ko te whakamahere tuatahi mo te whakaeke ki Pearl Harbor hei tiaki i te nekehanga ki te "Rohe Rauemi ki te Tonga" (te kupu Hapanihi mo te Dutch East Indies me te Tonga ki te Tonga o Ahia i te nuinga) i tiimata i te timatanga o te 1941 i raro i te mana o Admiral Isoroku Yamamoto, i te wa e whakahau ana i te Rererangi Whakakotahi a Japan. I whakaaetia ia ki te whakamahere me te whakangungu mo te whakaeke mai i te Imperial Japanese Navy General Staff i muri i te nui o te tautohetohe me te Naval Headquarters, tae atu ki te riri ki te whakarere i tana whakahau. I te timatanga o te puna o te tau 1941, i timata te whakamahere nui, ko te Rear Admiral Ryūnosuke Kusaka, me te awhina a Kapene Minoru Genda me te Tumuaki Tuarua o Yamamoto, Kapene Kameto Kuroshima. I ako nga kaihoahoa i te
1940 Te whakaekenga rererangi a Ingarangi ki te kaipuke Itari i Taranto.