Frank Capra and the War Department. Divide and Conquer Parts 1, 2, 3, 4 Public Domain Footage on 4 continuous discs, War Dept. film. Hitler needed to conquer Norway to gain air access to Great Britain. He easily conquers Norway. The Allies fight back and ultimately withdraw due to German air power. The Nazis continue into Belgium and Holland and then break through the Maginot Line. The Allies retreat at Dunkirk, the Nazis march into Paris. The Free French move into North Africa. The film ends with the hope that General de Gaulle will, with the help of the Allies, free France.