In 1911, disputes between German and French authorities, resulted in France ceding a large portion of their territory in French Congo to the Germans in exchange for German recognition of French authority in the Moroccan Protectorate. The area granted under the Treaty of Fez was known as Neukamerun. The Nationality Law of 1913 changed the basis for acquiring German nationality from domicile to patrilineality, but did not alter derivative nationality. In 1914, during World War I, Belgian, British, and French colonial troops, made up of mostly Africans launched the two-year Kamerun campaign. Securing the territory in 1916, Neukamerun was returned to France. The remainder of the territory was assigned at the end of the war in 1919 as a protected territory of both France and Britain.