Invasion of sovereign Poland: Nazi Wehrmacht soldiers break a barrier on the German-Polish state border between Danzig (Gdańsk) and Sopot during Operation Fall Weiss (Wojna obronna 1939 roku). The beginning of the Second World War.
Sources of information about the photo:
1. Bundesarchiv Bild 183-51909-0003
Date: September 1, 1939
Photo by Hans Sönnke