What battle in Europe turned the tide against germany in 1943?

D-Day, or the battle of Normandy. Hitler was convinced that Normandy was a fake push, and he thought that General Patton would come directly from Britain and push into his territory. However, Patton had a fake army set up to trick the Germans into ignoring the invasion of Normandy.

World war 2.

if that was what you were looking for.