Allied forces are destroyed in Crete, the Battle of Britain has repelled the Luftwaffe but the bombing campaign ("the blitz") has targeted British cities. Then, on 22nd June 1941, the world's attention turns to Eastern Europe where Hitler unleashes the greatest military operation the world has ever seen. Operation Barbarossa - four million soldiers, 600,000 vehicles, 750,000 horses on an almost 3,000 kilometer front... the invasion of Russia.