Josef Stalin, President Franklin Roosevelt and Prime Minister Winston Churchill at Tehran, 1943

Wartime Conferences of the 'Big Three': The 'Big Three' at Tehran. From left to right: Marshal Josef Stalin, President Franklin Roosevelt and Prime Minister Winston Churchill.

In 1943 the Allies met in Tehran to plan their strategy. Britain and the US agreed to launch a cross-Channel attack in the following spring. The Soviet Union had been demanding a ‘second front’ in the west since July 1941. This photograph shows (from left to right) Marshal Josef Stalin, President Franklin Roosevelt and Prime Minister Winston Churchill at Tehran.