Poland: invasion, partition and the beginning of occupation
Story period: September 1939
Location: Poland
Germany invaded Poland on 1 September 1939 and the Soviet Union attacked from the east on 17 September. The invasions led to partition and occupation, while Britain and France entered the war against Germany. Territorial conquest also exposed inhabitants to repression, forced displacement and labour.
Two invasions, a widening war
September 1939
Poland faced attack from west and east.
Britain and France declared war on Germany on 3 September, two days after the German invasion. Soviet forces invaded eastern Poland on 17 September. These were different attacks within the destruction of the Polish state’s control over its territory.
The Nazi–Soviet pact had included a secret definition of spheres of influence in the region. Reading its public promise of non-aggression alone would miss what the two powers had arranged about other countries.
Occupation was more than a border change
From 1939
Conquest brought new administrations and violence against inhabitants.
German authorities annexed some occupied territories to the Reich and administered another part as the General Government. Occupation brought killings of political, intellectual and religious leaders, resettlement and forced labour for Germany.
The later Warsaw Ghetto and Auschwitz stories follow particular institutions and experiences of persecution in occupied Poland. Their histories developed over several years; they should not be read as if every later crime had already occurred during the September invasion.
The marker represents a country-wide story, not a precise battle site or historical boundary. Its navigation reference comes from modern Wikidata records.