Before the attack on Pearl Harbor, the British Royal Air Force stood alone trying to ward off the mighty Nazi Luftwaffe during the Battle of Britain. But after the arrival of the U.S. Army Air Corps, the Yanks made it possible to take the fight to the skies over Germany, which led to air supremacy by the Allied forces. Rare footage shows both aircraft and combat. 2010/color/70 min/NR/fullscreen.