The greatest deception deployed by the German Army during the the Ardennes Offensive was to parachute Nazi commandos into the American lines - men who had been raised in the U.S. and spoke the language well. They wore American uniforms and performed acts of sabotage, and as this article spells out, lured many GIs to their deaths.
Two of these Germans attempted to kidnap and assassinate General Eisenhower, click here to read about it...