The Allied Deception effort, code named Operation Bodyguard, prior to the Normandy invasion was one of the greatest misinformation campaigns of all time. Operation Bodyguard was intended to use deception to fix German forces in areas away from the actual invasion site on the Cotentin Peninsula in Normandy.
One of the key elements of Operation Bodyguard was code named ‘Fortitude South’ -- a fictitious invasion effort directed against coastal Belgium and northern France in the Dover Straits area.
The Allies started with the fact that the German High Command believed our sea-borne invasion force would cross the treacherous waters of the English Channel via the shortest possible route, that being the Pas de Calais, or the Straits of Dover. Photo reconnaissance demonstrated that the Axis has concentrated its defensive efforts in this area. The success of Operation Bodyguard reinforced Hitler's belief that this was to be the actual invasion site, and Allied forces derived two critical benefits: (1) powerful defensive resources were focused at the Pas de Calais, far from the actual invasion, (2) the actual invasion was masked as a diversion, buying the Allied forces more time to land reinforcements, secure the beachhead and break out.
Fortitude South was the backbone of the entire deception effort. This included the notional 50 division First U.S. Army Group (FUSAG) ‘poised’ for a continental invasion across the Pas de Calais. The creation of FUSAG, code named Quicksilver, was no small effort. It was the largest, most elaborate, most carefully-planned, and most vital, of all the Allied deception operations. It made full use of the years of experience gained in every branch of the deceptive art -- visual deception and misdirection, the deployment of dummy landing craft, aircraft, and paratroops, fake lighting schemes, radio deception, sonic devices, and a whole fictitious army group, complete with ‘camps’ made of Hollywood style ‘back-lot buildings’ and filled with literally hundreds of inflatable tanks and trucks.
The final piece in the deception puzzle was "Garbo" a Spaniard the Nazi's believed was a fascist agent, who was actually a British double agent. Garbo had always fed the Nazi's accurate (but outdated or unimportant) information, and they trusted him. A few hours prior to the launch of the invasion Garbo contacted the Nazis and told them that there would be an invasion in Normandy on June 6th, but that is was a feint, and the real invasion with FUSAG was occurring a week later in the Pas De Calais. The Nazi's seeing the invasion hit right when and where Garbo told them it would in Normandy, bought that it was a false invasion hook line and sinker, and refused to move their forces out of the Pas de Calais for weeks. After the War Garbo was awarded the highest civilian award given out by Great Britain (I think the George Cross - Rob, help me out:wink2
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The men behind Operation Bodyguard were responsible, in great part, for the success of Operation Overlord, and saved countless Allied lives. We owe them a great debt of gratitude.