Mezue ahịrịokwu na-esonụ: Na 17 Septemba 1939, na-eso mwakpo Germany nke ọdịda anyanwụ Poland dịka usoro nzuzo nke Molotov-Ribbentrop Pact, ndị agha Soviet wakporo ọwụwa anyanwụ Poland. Ebe ọ bụ na ọtụtụ ndị agha Polish na-elekwasị anya na ọdịda anyanwụ na-alụ ọgụ Nazi Germany, ndị Red Army zutere obere nguzogide na ndị agha ha kwagara ngwa ngwa n'ebe ọdịda anyanwụ, na-awakpo mpaghara Voivodeship n'ụzọ dị mfe. Ha zutere ndị Germany na-awakpo ha n'akụkụ Curzon Line ma jide
mmeri a na-eme n'otu.