The invasion of Sicily in July 1943 led to the collapse of the Fascist Italian regime and the fall of Mussolini, who was deposed and arrested by order of King Victor Emmanuel III on 25 July. The new government signed an armistice with the Allies on 8 September 1943. However, German forces soon took control of northern and central Italy; Mussolini, who was rescued by German paratroopers, established a collaborationist puppet state, the Italian Social Republic (RSI), to administer the German-occupied territory. The Germans, sometimes with Italian fascists, also committed several atrocities against civilians and non-fascist troops. As a result, the Italian Co-Belligerent Army was created to fight against the RSI and its German allies, alongside the large Italian resistance movement, while other Italian troops, loyal to Mussolini, continued to fight alongside the Germans in the National Republican Army. This period is known as the Italian Civil War. In April 1945, Mussolini was captured by the Italian resistance and summarily executed by firing squad. The campaign ended when Army Group C surrendered unconditionally to the Allies on May 2, 1945, one week before the formal German Instrument of Surrender. The independent states of San Marino and the Vatican, both surrounded by Italian territory, also suffered damage during the conflict.