1939 to 1945: The Nazis planned to ethnically cleanse the whole Polish population apparently to a germanisation Master Plan called Generalplan Ost.[2] Eventually in the course of Nazi occupation up to 1.6 to 2 million Poles were expelled, not counting millions of slave labourers deported from Poland to the Reich.[3] 1939 to 1940: Expulsions of 680,000[4] Poles from German occupied Wielkopolska (German -Reichsgau Wartheland).