Who was the main commander of the allied forces

General Dwight D. Eisenhower

Supreme Headquarters Allied Expeditionary Force (SHAEF; /ˈʃeɪf/ SHAYF) was the headquarters of the Commander of Allied forces in north west Europe, from late 1943 until the end of World War II. U.S. General Dwight D. Eisenhower was the commander in SHAEF throughout its existence.

General Dwight D. Eisenhower
Supreme Headquarters Allied Expeditionary Force was the headquarters of the Commander of Allied forces in north west Europe, from late 1943 until the end of World War II. U.S. General Dwight D. Eisenhower was the commander in SHAEF throughout its existence.