The Italian Co-Belligerent Army (Esercito Cobelligerante Italiano), or the Army of the South (Esercito del Sud), was the army of the Italian Royalist forces fighting on the side of the Allies during World War II. The Italian Co-Belligerent Army was formed in southern Italy after the Allied armistice with Italy was declared on September 8, 1943; King Victor Emmanuel III had dismissed Benito Mussolini as Prime Minister in July 1943 following the Allied invasion of Southern Italy, and had nominated Marshal of Italy (Maresciallo d'Italia) Pietro Badoglio instead.