sentences:  After the Anglo-Soviet invasion of Iran (August–September 1941), Stalin agreed on 18 March 1942 to evacuate part of the Polish formation as a military force to Iran, and the soldiers transferred across the Caspian Sea to the port of Pahlavi in Iran.Eventually all the soldiers and civilians gathered were allowed to leave the Soviet Union and to enter British-controlled territories.More military personnel and civilians were transferred later that summer, up to the end of August, by ship and by an overland route from Ashgabat, Turkmenistan to the railhead in Mashhad, Iran.