Chad Basin British and French concluded an agreement to clarify the boundary between French West Africa and what would become Nigeria. A boundary was agreed along a line from Say on the Niger to Barruwa on Lake Chad, but leaving the Sokoto Caliphate in the British sphere. Parfait-Louis Monteil was given charge of an expedition to discover where this line actually ran. On 9 April 1892 he reached Kukawa on the shore of the lake. Over the next twenty years a large part of the Chad Basin was incorporated by treaty or by force into French West Africa. On 2 June 1909
Chad yet occur in Chad. In 2006 and in 2008 rebel forces attempted to take the capital by force, but on both occasions failed. An agreement for the restoration of harmony between Chad and Sudan, signed 15 January 2010, marked the end of a five-year war. The fix in relations led to the Chadian rebels from Sudan returning home, the opening of the border between the two countries after seven years of closure, and the deployment of a joint force to secure the border. In May 2013, security forces in Chad foiled a coup against President Idriss Deby that had been