With the unification of the country Milan became the dominant commercial center of northern Italy. In 1919 Benito Mussolini rallied the Blackshirts for the first time in Milan, and later they began their March on Rome from Milan. During World War II Milan was extensively damaged by Allied bombings. Upon the surrender of Italy in 1943 German forces occupied northern Italy until the end of the war in 1945. Members of the Italian resistance in Milan took control of the city and executed Mussolini, his mistress and other leaders of his Fascist government by hanging Piazzale Loreto in Milan.