Made by the National Film Board of Canada in 1941 and directed by Stuart Legg, this wartime short became the first documentary ever to win an Academy Award. Assembled from combat and home-front footage, it lays out the strategy behind the Battle of Britain: the Royal Air Force pilots scrambling against Luftwaffe bombers, the Royal Navy patrolling the Channel, anti-aircraft crews on rooftops, and civilians working through the Blitz. Narration by Lorne Greene, delivered in the clipped, urgent style that became his trademark, frames the island's defense as a coordinated effort across air, sea, and land rather than a single dramatic stand. The film moves through radar stations, fighter squadrons, and coastal defenses to show how Britain's forces tracked and intercepted German raids. Produced as propaganda to rally Allied support, it doubles now as a document of how governments explained the war to their own citizens while it was still being fought.