Step 1 : Introduction to the question "1. Who was the supreme commander of the operation? "
...1. Winston Churchill 2. Harry Truman 3. Bernard Montgomery 4. Dwight Eisenhower He was supreme commander of the Allied Expeditionary Forces, which consisted mainly of U.S., British and Canadian forces, together with some Poles and Free French. Montgomery was, however, commander-in-chief of ground forces.