Rubuta ci gaba don wannan sakin layi - A ranar 7 ga Disamba, 1941, Daular Japan ta shiga yaƙin ta hanyar kai hari kan mulkin mallaka na Burtaniya na Malaya
da kuma sansanin sojan ruwan 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.