High Quality Content by WIKIPEDIA articles! The Italian resistance movement was a partisan force during World War II. After Italy's armistice on 8 September 1943, the Italian resistance movement became massive. The Italian partisans, as military formations of the Italian resistance movement, fought German occupying forces in Italy and Greece and the Mussolini- led Fascist Italian Social Republic. All opposition to Nazi-Fascism in Italy during the final period of World War II can be broadly defined as Resistenza.