Hitler bombing Poland’s air fields Shortly after noon on August 31 invasion of Poland "Germans invade Poland - Sep 01, 1939 - HISTORY.com" Germans invade Poland Why the Germans Chose Poland to Invade history.com History.com: This Day in History: Germans Invade Poland Source invasion of Poland Germany invaded Poland invasion of Poland "Germans invade Poland - Sep 01, 1939 - HISTORY.com" More info invasion invasion of Poland invasion of Poland Source invasion of Poland The Polish Campaign More Info History: September 1, 1939: Germans Invade Poland Hitler bombing Poland’s air fields Shortly after noon on August 31 "Germans invade Poland - Sep 01, 1939 - HISTORY.com" German occupation of Poland More info "Germans invade Poland - Sep 01, 1939 - HISTORY.com" Germany invaded Poland History: September 1, 1939: Germans Invade Poland quickly defeats the Polish army History.com: This Day in History: Germans Invade Poland Shortly after noon on August 31