Rubuta ci gaba don wannan sakin layi - mamayewar Nazi ta Jamus zuwa Poland a ranar 1 ga Satumba, 1939, da kuma sanarwar yaƙi da Biritaniya da Faransa suka yi wa Jamus kwana biyu bayan haka ya nuna farkon Yaƙin Duniya na II. Bayan sanarwar yaƙi, yammacin Turai ya ga ƙaramin ƙasa ko iska mai fafatawa ta soja da farko, kuma an kira lokacin "Yaƙin Ƙarya". A gabashin Turai, duk da haka, yarjejeniyar tsakanin Tarayyar Soviet da Nazi Jamus da aka sanya hannu a ranar 23 ga Agusta ta buɗe hanya a watan Satumba don mamayewar Tarayyar Soviet a gabashin Poland, wanda aka raba tsakanin masu mamaye biyu kafin ƙarshen watan. Tarayyar Soviet ta fara sabon harin soja ta hanyar mamaye Finland
a karshen watan Nuwamba.