The conference was scheduled to be convened on November 28, 1943 at 4 p.m. Stalin arrived long before, followed by Roosevelt, brought his wheelchair from his accommodation next to the event venue. Roosevelt, who had travelled 11,000 kilometres to participate and whose health had already deteriorated, was received by Stalin. It was the first time they met. Churchill, who was walking with his coworkers from the neighbouring dwellings, arrived half an hour later.  According to Charles Bohlen, translator for FDR, FDR was accompanied by Averell Harriman and Harry Hopkins. Stalin was accompanied by Vyacheslav Molotov and Kliment Voshilov. Churchill brought Anthony Eden and Lord Ismay, and his translator was Major Arthur Birse. The statement of the three heads of state and government at the end of the conference, on 1 December 1943, was as follows: in the field of military strategy, Stalin had, in this case, consolidated his reputation as a “master of the battlefield”. General Sir Alan Brooke, who attended the conference as Chief of the Imperial Staff, went on to say that Stalin had “a very high caliber military brain” and surpassed both Roosevelt and Churchill in this regard (he also commented elsewhere that the Soviet leader had a “cold, intelligent and unpleasant death” face, and every time I look at him , I can imagine that it sends people to their loss without ever turning a hair”).
Roosevelt and Stalin spent much of the conference convincing Churchill to commit to an invasion of France, and finally on November 30, when Roosevelt announced at lunch that they would launch the invasion in May 1944.  This pleased Stalin, who had urged his allies to open a new front in the West to relieve the pressure on his troops. This decision is perhaps the most critical to come out of this conference, since the desired effect of the liberation of Soviet troops was achieved, which resulted in a Soviet rally and an advance towards Germany, a tide that Hitler failed to contain. On December 1, 1943, the three heads of state and government met, made statements and negotiated the following military conclusions at the conference. The Tehran Conference (codenamed Eureka) was a strategic meeting of Joseph Stalin, Franklin D. Roosevelt and Winston Churchill from November 28 to December 1, 1943, after the Anglo-Soviet invasion of Iran. It took place at the Soviet Embassy in Tehran, Iran (Persia). It was the first of the conferences of the “Big Three” Allied leaders (Soviet Union, United States and United Kingdom). She was closely following the Cairo conference that took place from 22 to 26 November 1943 and preceded the Yalta and Potsdam conferences in 1945.
Although the three leaders arrived with different objectives, the most important of the Tehran conference was the commitment of the Western Allies to open a second front against Nazi Germany. The conference also focused on the relations of the “three major allies” with Turkey and Iran, operations in Yugoslavia and against Japan, and the post-war regime. A separate protocol, signed at the conference, promised the Three Greats to recognize Iran`s independence. The Tehran conference took place in November 1943. Tehran is in Iran today. At the time of the Tehran conference, the Second World War was still raging and the Allies` hopes of victory were slim.