Operation Overlord opens with Eisenhower's order to the Allied troops and roughly 150,000 men landing on the Normandy coast on June 6, 1944. This film follows the campaign day by day from that morning through the liberation of Paris, covering the hundred days that turned a beachhead into a broken German line. Colorized archival footage, much of it rarely seen, is paired with testimonies from soldiers on both the Allied and German sides, mixing large-scale combat sequences with personal, intimate accounts of fear, waiting, and loss. The narrative tracks the hedgerow fighting inland from the beaches, the slow grinding advance through Norman towns, and the breakout that finally let the Allies push toward Paris. Rather than treating D-Day as a single triumphant day, the film treats it as the start of a long and costly campaign, giving equal weight to the tactical struggle after the landings as to the invasion itself. It closes on the celebrations in a liberated Paris, framed against the price paid to get there.