This is a totally real army. Nothing to see hear. -The Allies
During the attack at Normandy, Hitler was asleep. His men were too frightened of him to wake him up during the battle. He was unable to coordinate a counter strike with his generals, which is probably why they lost. And they got confused.
The Allied Leaders
We need to find a way to get some really good soldiers in there
This is CLASSIFIED Information. No looking
The Allies sent transmissions and messages that were designed to be caught by the Germans and that tricked them into thinking the battle was in a different place.
The Terrain and Beaches
The Allies, under the direction of FDR and Churchill, built a fake army using rubber and other materials to confuse and trick German Forces as to where they were going to attack.
Other German Defenses
The allied leaders including FDR and Churchill made a plan and properly executed it to defeat the Germans.
The beaches on D-Day were very hard to pass. The German armies had set up tons of defenses to prevent an attack by the allies.
Along with all the defenses in the water, the Germans built defenses above the water. They had machine guns and tank like Guns atop hills.