Invading German troops approach Bydgoszcz. Poland, September 18, 1939. Photograph »

German forces in the outskirts of Warsaw. In the background of the photograph, the city burns as a result of the German military assault. Warsaw, Poland, September 1939. Photograph »

The Sigismund Monument stands amid rubble in the Polish capital after Germany's Blitzkrieg assault. Warsaw, Poland, 1939. Photograph »

View of the entrance to a marketplace reduced to rubble as a result of a German aerial attack. Warsaw, Poland, September 1939. Photograph »

Poles walk among the ruins of besieged Warsaw. Photograph »

German troops parade through Warsaw after the surrender of Poland. Warsaw, Poland, September 28-30, 1939. Photograph »

Adolf Hitler (lower right) gives Nazi salute as he reviews victorious German troops. Warsaw, Poland, October 5, 1939. Photograph »

German soldiers parade in Pilsudski Square. Warsaw, Poland, October 4, 1939. Photograph »

Invading German troops enter the town of Lodz. Poland, September 8, 1939. Photograph »

Invading German soldiers raise the Nazi flag in front of the city hall. Gdynia, Poland, September 1939. Photograph »