The Armistice of Cassibile was an armistice signed on 3 September 1943 by Walter Bedell Smith and Giuseppe Castellano, and made public on 8 September, between the Kingdom of Italy and the Allies. The armistice was approved by both King Victor Emmanuel III and Italian Prime Minister Pietro Badoglio. The armistice stipulated the surrender of Italy to the Allies.
Operation Achse which lasted from 8 to 19 September, was the code name for the German operation supported by Italian fascists to forcibly disarm the Italian armed forces after Italy's armistice with the Allies on 3 September 1943. The Germans disarmed over a million Italian troops within a matter of days, annihilating the Italian military and state.