The general who led the Allied forces in the European theater during World War II was Dwight D. Eisenhower. As the Supreme Commander of the Allied Expeditionary Forces, Eisenhower orchestrated major military operations, including the successful invasion of Normandy on June 6, 1944, also known as D-Day. His leadership and strategic planning were instrumental in defeating Nazi Germany. After the war, Eisenhower served as President of the United States, where he continued to influence global politics during the Cold War.