Kammala wannan jumla: A ranar 7 ga Disamba, 1941, Daular Japan ta shiga yaki ta hanyar kai hari kan
Turawan mulkin mallaka na Birtaniya na Malaya da kuma sansanin sojan ruwa na Amurka a Pearl Harbor. Bayan kwana hudu, Jamus ta sanar da yaƙi ga Amurka, ta sa Amurkawa cikin rikici na Turai. Sojojin Amurka sun fi son Operation Sledgehammer, mamayewa ta hanyar tashar tashar jiragen ruwa na Faransa da Jamus ta mamaye. Irin wannan motsi ya yi tsayayya da Birtaniya, wanda ya yarda da rashin ƙarfi na soja na Allies don yin irin wannan ƙoƙari, musamman ma a matsayin sojojin Birtaniya za su samar da babban karfi don irin wannan aiki. A watan Yulin 1942, Anglo-Americans sun hadu a London kuma sun yarda cewa za a jinkirta Operation Roundup, magajin Sledgehammer, kuma za a fara ayyukan hadin gwiwa a Arewacin Afirka.