British forces from British Nigeria and French forces from French Equatorial Africa and Gabon attacked German Kamerun. Allied naval superiority allowed the swift capture of the Cameroonian coast, cutting the Germans off from reinforcement or resupply. In early 1916, the last Germans surrendered or withdrew from Cameroon into neutral Spanish Guinea. In 1919, Germany signed the Treaty of Versailles, formally surrendered its colonies to the Allies. A few weeks later, Britain and France issued a statement known as the Simon-Milner Declaration, delineating the frontiers between the British Cameroons and French Cameroon. This boundary was recognized internationally in 1922 and Britain and France were given control of their respective regions as League of Nations Mandates. The British Cameroons Administration Ordinance, 1924 divided British Cameroons into the Northern Cameroons (administered as part of Northern Nigeria) and the Southern Cameroons (administered as part of Eastern Nigeria). When the League of Nations mandate system was transmuted into the UN trusteeship system in 1946, this arrangement was again provided for in the Order-in-Council of 2 August 1946 providing for the administration of the Nigeria Protectorate and Cameroons under British mandate. In 1953, the Southern Cameroons representatives in the Eastern Nigerian Legislature demanded a separate regional government for the Southern Cameroons with seat in Buea. Under the Lyttleton Constitution of Nigeria in 1954, Southern Cameroons gained limited autonomy as a Quasi-Region within the Nigerian Federation. E.M.L. Endeley emerged as leader of the Quasi-Region of Southern Cameroons, with his official title being Leader of Government Business. In 1957, United Nations Resolutions 1064 (XI) of 26 Feb 1957 and 1207 (XII) of Dec 13, 1957 called on the Administering Authorities to hasten arrangements for Trust territories to attain self-governance or independence. In 1958, the Southern Cameroons attained the status of a full autonomous region of the Nigerian Federation and Endeley's official title accordingly changed to Premier. Despite calls by Southern Cameroons leaders for full independence as a separation nation, United Nations' resolutions 1350 (XIII) of March 13, 1959 and 1352 (XIV) of October 16, 1959 called for plebiscites in Southern Cameroons and Northern Cameroons with two alternatives for ending the trusteeship: joining Nigeria or joining Cameroon. Independence and the plebiscite (1961) Despite calls by Southern Cameroons leaders for full independence, United Nations' resolutions 1350 (XIII) of March 13, 1959 and 1352 (XIV) of October 16, 1959 called on Britain, the Administering Authority to organize separate plebiscites in Southern