On September 15, 1940—Battle of Britain Day—the Luftwaffe launched what would become the climactic daylight assault of their campaign against Britain. In a desperate final effort to enable Operation Sea Lion, the German invasion of Britain, over 500 bombers escorted by hundreds of fighters targeted London's railways and dockyards in two massive raids. However, RAF Fighter Command rose to meet them with unprecedented coordination, deploying every available squadron in a series of perfectly timed intercepts that turned the skies above London into absolute mayhem. Despite wildly exaggerated victory claims on both sides, the day's fighting proved that Fighter Command was far from the spent force the Germans had hoped, while the Luftwaffe's mounting losses and fuel limitations exposed the futility of their campaign. As weather closed in and Hitler postponed Sea Lion indefinitely, September 15th marked not just the end of the daytime Battle of Britain, but the beginning of a new phase—the Blitz.

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