The Spanish Civil War broke out in 1936: on 17 and 18 July, part of the military carried out a coup d'état that triumphed in only part of the country. The situation led to a civil war, in which the territory was divided into two zones: one under the authority of the Republican government, that counted on outside support from the Soviet Union and Mexico (and from International Brigades), and the other controlled by the putschists (the Nationalist or rebel faction), most critically supported by Nazi Germany and Fascist Italy. The Republic was not supported by the Western powers due to the British-led policy of non-intervention. General Francisco Franco was sworn in as the supreme leader of the rebels on 1 October 1936. An uneasy relationship between the Republican government and the grassroots anarchists who had initiated a partial Social revolution also ensued.