Tehran Conference

In the Iranian capital the Big Three met all together for the first time. The Western Allies committed themselves to landing in northern France (Operation Overlord) in May 1944, and Stalin promised a simultaneous offensive in the east and entry into the war against Japan once Germany was defeated. They also discussed the future organisation of peace and the partition of Germany.

Poland was discussed without its government. Stalin demanded an eastern border on the Curzon Line, and Churchill proposed moving Poland westwards, as far as the Oder, at Germany's expense. Roosevelt privately agreed but did not want to commit himself publicly. Roosevelt asked for the arrangements to be kept secret until the US presidential election that autumn. The Tehran understandings shaped the decisions taken at Yalta and Potsdam.