Operation Overlord tells the story of the Allied invasion of Normandy, the meticulously planned assault that broke Hitler's grip on Western Europe. The film traces how months of secrecy and deception, including efforts that kept German attention fixed elsewhere, allowed Allied forces to land on the French coast largely undetected until the last moment. Archival footage and expert narration walk through the scale of the operation, from the naval bombardment offshore to the beach landings themselves, and the heavy cost paid in the opening hours and days. Thousands of soldiers died securing the beachheads that would become the staging ground for the liberation of France and, eventually, the rest of occupied Western Europe. The film treats June 6, 1944 not as a single dramatic day but as the hinge point of a much longer campaign, showing how the initial breach was exploited and expanded in the weeks that followed as Allied forces pushed inland against German resistance.