Occupation of Iran in World War 2

The occupation of Iran proved of vital importance to the Allied cause and brought Iran closer to the Western powers. Britain, the Soviet Union, and the United States together managed to move over 5 million tons of munitions and other war materiel across Iran to the Soviet Union. In addition, Iran signed a tripartite treaty of alliance with Britain and the Soviet Union under which Iran agreed to extend non-military assistance to the war effort. The two Allied powers, in turn, agreed to respect Iran's independence and territorial integrity and to withdraw their troops from Iran within six months of the end of hostilities.