German forces withdrew on 12 October 1944, and the government in exile returned to Athens. After the German withdrawal, the EAM-ELAS guerrilla army effectively controlled most of Greece, but its leaders were reluctant to take control of the country, as they knew that Soviet premier Joseph Stalin had agreed that Greece would be in the British sphere of influence after the war. Tensions between the British-backed Papandreou and the EAM, especially over the issue of disarmament of the various armed groups, led to the resignation of the latter's ministers from the government.