History of Chad Africa's major language groupings south of the Sahara Desert (except Khoisan, which is not considered a valid genetic grouping anyway), i. e. the Afro-Asiatic, Nilo-Saharan and Niger–Congo phyla, originated in prehistoric times in a narrow band between Lake Chad and the Nile Valley. The origins of Chad's peoples, however, remain unclear. Several of the proven archaeological sites have been only partially studied, and other sites of great potential have yet to be mapped. At the end of the 1st millennium AD, the formation of states began across central Chad in the sahelian zone between the desert and the savanna. For
Military of Chad participated in a peace mission under the authority of African Union in the neighboring Central African Republic to try to pacify the recent conflict, but has chosen to withdraw after its soldiers were accused of shooting into a marketplace, unprovoked, according to BBC. "Currently, Cameroon has an ongoing military-military relationship with Chad, which includes associates training for Chadian military in Cameroon. There are four brigade Chado-Cameroonian in January 2012. Cameroon and Chad are developing excellent relations". Military of Chad The military of Chad consists of the National Army (includes Ground Forces, Air Force, and Gendarmerie), Republican Guard, Rapid Intervention Force,