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As D-Day approaches during World War II, British officers Major Harvey (John Mills) and Colonel E.F. Logan (Cecil Parker) plot to give the Germans misinformation about their military strategy. When Harvey spots an actor (M. E. Clifton-James, playing himself in this true story) who looks just like British military leader General Montgomery, he uses him to impersonate the general in North Africa. James thus draws German troops away from Normandy, becoming both a hero and a major military target. Wikipedia