Today marks the 70th Anniversary of the German Invasion of Poland. Although the above picture lacks the iconicity of many WWII pictures, it had an immense documentary and propaganda values. It was copied and reproduced again and again on many textbooks.
However, the photo of German troops parading through Warsaw after the surrender of Poland probably taken as late as September 30th, 1939. The invasion won’t end until early October 1939, shortly after the Soviet Union invaded the country from the east and subsumed the Baltic States. The devil’s pact between Hitler and Stalin (Ribbentrop-Molotov Pact) enabled these cataclysmic events to unfold and pushed the world into another world war.
Seventy years later, the invasion is still a contentious issue. In August 2009, the parliamentary assembly of the Organization of Security and Cooperation in Europe (OSCE) equated the Soviet Union and Nazi Germany but noting that Stalinism is as bad as Nazism. The resolution drew ire from the Russian government.
See scenes from the Invasion of Poland in September 1939.