Gerd von Rundstedt
In September 1939 Frank was assigned as Chief of Administration to Gerd von Rundstedt in the German military administration in occupied Poland. Beginning 26 October 1939, following the completion of the invasion of Poland, Frank served as Governor-General of the occupied Polish territories, overseeing the General Government, the area of Poland not directly incorporated into Germany (roughly 90,000 km2 out of the 187,000 km2 Germany had gained).