 Italy entered World War II when they declared war on both France and Great Britain on 10 June 1940.The Tripartite Pact, signed in Berlin, Germany on 27 September 1940, united the Axis Powers (Italy, Germany and Japan).After the downfall of Fascism and the armistice with the Allies in September 1943, a number of partisan forces were formed to fight the German Nazis and the Fascist Italian puppet regime.