The Potsam Conference was held at Cecilienhof, the home of Crown Prince Wilhelm Hohenzollern, in Potsdam, Germany, from July 16, 1945 to August 2, 1945. The participants were the Soviet Union, the United Kingdom, and the United States. The three nations were represented by Communist Party General Secretary Joseph Stalin, Prime Minister Winston Churchill and later Clement Attlee, and President Harry S Truman. The French were not invited to participate. Although Poland made the fourth-largest troop contribution to the Allied war effort, after the Soviets, the British and the Americans, Polish leaders were not invited to participate in the conference even though earlier they had been promised entry.