The Italian resistance movement ( or just Resistenza) is an umbrella term for resistance groups that opposed the occupying German forces and the Italian Fascist puppet regime of the Italian Social Republic during the later years of World War II. It was formed by pro-Allied Italians, following the Allied invasion of the country, the armistice between Italy and Allied armed forces, and German military occupation of northern Italy. The movement is also known as the Italian resistance and the Italian partisans. The brutal conflict they took part in is referred to as the Italian Liberation War (when referring to the part they took in the Italian Campaign against the Axis) or as the Italian Civil War (when referring specifically to the conflict with the Fascists). The modern Italian Republic was declared to be founded on the struggle of the resistance.