The Post Office Department issued the Poland stamp of the Overrun Countries Series on June 22, 1943. The stamp features the Polish flag in red and white, within a purple frame. Germany overran and occupied Poland in September 1939, in line with Germany's 'lebensraum' or greater living space for Germany expansionary policy. Parts of Poland nearest to Germany were annexed. The Polish occupation was the longest and most devastating of World War II, with deaths ultimately numbering well over one million.