World War II in Numbers S01E02 - Backs to the Wall/Global War

A look at the Battle of Britain, examining the limited resources the British military were left with following the retreat from Dunkirk, and the pressure on German forces to conquer England quickly, so attention could be switched to Russia. The second half of the programmes examines the US entry into the war, in defiance of the promise made by President Roosevelt during his re-election campaign.