Operation Bodyguard

As Germany was gaining power throughout all of Europe, the allied leaders decided they would invade Nazi Germany through the beaches of Normandy. It took them almost an entire year to make a plan, and they even created a big misinformation campaign codenamed Operation Bodyguard to essentially make the Nazi's think the invasion would be anywhere except on Normandy's beaches. A lot of the success of this campaign came from the German spies that were in Britain and turned into double agents. Through these double agents, the allies were able to misinform Hitler on a lot of information. One of the most famous ways the Allies were able to deceive the Nazi's was by faking a massive troop buildup in an area away from the actual landing spot. They broadcasted fake radio transmissions and even tricked the German planes by having many balloon tanks to make it seem as if there was a buildup of troops.  During this time, they even hired an actor who resembled General Bernard Montgomery to further convince the Germans. Even while the Normandy invasion began, Juan Pujol Garcia a double agent working for Britain kept sending notes to Berlin that it was simply a distraction and that a major attack was yet to come. This gave the Allies the advantage they needed to be able to turn the tide of World War II and begin to liberate the countries in Europe.