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4. Hoodwinking Hitler
The Allied effort to hoodwink Adolf Hitler about the invasion was code-named Fortitude, and it was nearly as elaborate and detailed as the invasion itself. The Allies went so far as to parachute dummies, outfitted with firecrackers that exploded on impact, behind enemy lines as a diversion. Under an effort code-named Window, Allied airplanes dropped strips of aluminum foil cut to a length that corresponded to German radar waves. The effect created two phantom fleets of bombers out of thin air -- and ingenuity.