Boko Haram, the bush masters, village attackers and terrorists, have inexorably extended their insurgency beyond national borders to the entire area of the former Kanem-Bornu Empire. The sect gained a safe haven when it took the Mandara Mountains on Cameroon’s border in 2014. In Boko Haram, the mountain people see the return of precolonial raiders and a revival of ancient rivalries. Excessive islamization drives the communities’ indoctrination into the service of Boko Haram. All communities are ordered to choose sides for or against this new islamic order, plunging many regions into a climate of civil war.