"The Battle of Britain," Chapter lll of Frank Capra's "Why We Fight"series, begins after Hitler's conquest of Western Europe. Once firmly in control of the parts of France and Norway closest to Great Britain, the Nazis commence their massive air assault on the British isles. Outnumbered six to one, the fighters of the Royal Air Force defend their skies against the Luftwaffe for close to four months. British defenses forced the Germans to change strategies, switching to more frightening night raids that terrorized London. But the British resolve won the day, in grand fashion.