Kammala jumla mai zuwa: Jafananci sun yi niyyar kai harin ne a matsayin matakin rigakafi don hana Amurka Pacific Fleet daga tsoma baki tare da ayyukan soja da aka tsara a kudu maso gabashin Asiya a kan ƙasashen waje na United Kingdom, Netherlands, da Amurka. A cikin sa'o'i bakwai an shirya hare-haren Jafananci a kan Amurka da ke Philippines, Guam, da Wake Island da kuma a kan Birtaniya a
Malaya, Singapore, da kuma Hong Kong. Bugu da ƙari, daga ra'ayin Jafananci, an gan shi a matsayin hari na farko "kafin man fetur ya ƙare".