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In page Mordechai Anielewicz:

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On 7 September 1939, a week after the German invasion of Poland, Anielewicz traveled with a group from Warsaw to the east of the country in the hopes that the Polish Army would slow down the German advance. When the Soviet Red Army invaded and then occupied Eastern Poland in accordance with the Molotov–Ribbentrop Pact, Anielewicz heard that Jewish refugees, other youth movement members and political groups had flocked to Wilno, which was then under Soviet control.[citation needed]