In 1914, as World War I raged Britain reclaimed the Ambas Bay coastal area from Tiko through Bimbia, Victoria, Idenau all the way to the Bakassi Peninsula. However Britain also advanced inland for the first time, stretching to present-day Nkambe, and then further north to the Lake Chad areas. That whole strip of territory was then denoted as British Cameroons, which was administered as an appendage of Nigeria. In 1916 Britain and France signed a treaty known as the Simon-Milne Declaration, to respect the frontiers between the British Cameroons and French Cameroun. When Germany was finally defeated in 1918, it was compelled to sign the Treaties of Versailles in 1919, relinquishing control of all its colonies to the Allied and Associated Powers, including the territory known since 1916 as the British Cameroon. On 10 July 1919 Britain and France reiterated the boundary treaty concluded in 1916 and both undertook to administer their respective new colonial territories in accordance with Article 22 of the League of Nations Covenant. British sovereignty over the Southern Cameroons was maintained until 1922 when Southern Cameroons became a Mandated Territory by the League of Nations.