Throughout the rest of the war, the United Kingdom and the United States used Iran as an important supply line to the Soviet war effort against Nazi Germany. Thirty thousand non-combatant U.S. troops arrived to move these supplies, and transit through Iran was later termed a "bridge to victory". At the Tehran Conference in 1943, the Big Three gave additional assurances concerning Iran's future sovereignty and territorial integrity, as well as a promise to assist in its post-war reconstruction and development.