Why did general s patton lead a dummy army to a different beach on d-day

To give the appearance of a massive troop buildup in southeast England, the Allies created a largely phantom fighting force, the First U.S. Army Group, headed by George Patton, the American general whom the Nazis considered to be the enemy’s best commander and the logical man to lead a cross-channel invasion. The Allies broadcast endless hours of fictitious radio transmissions about troop and supply movements and planted wedding notices for fake soldiers in local newspapers. They deceived Nazi aerial reconnaissance planes by fashioning dummy aircraft and an armada of decoy landing crafts, composed only of painted canvases pulled over steel frames, around the mouth of the River Thames. They even deployed inflatable Sherman tanks, which they moved to different locations under the cover of night, and used rollers to simulate tire tracks left behind in their wake.

*but it was really to fool adalf hitler