Before Allied troops landed in Normandy, the Atlantic Wall had already been penetrated in secret. German Field Marshal Gerd von Rundstedt later admitted the Allies understood Hitler’s great coastal fortress better than many of the men defending it. This is the hidden intelligence war that made D-Day possible.
From French resistance networks and stolen fortification plans to aerial reconnaissance, submarine missions, and ordinary civilians mailing holiday photographs to British intelligence, the Allies slowly reconstructed the Atlantic Wall piece by piece long before June 6th, 1944.
This WW2Tales documentary explores the forgotten espionage, deception, and intelligence operations behind D-Day — and why Germany’s greatest defensive system collapsed not only because of Allied firepower, but because the Allies learned how to see the wall more clearly than the Germans themselves.
