Fula people, with Arabic and North African roots, adopted Islam early. According to David Levison, adopting Islam made the Fulani feel a "cultural and religious superiority to surrounding peoples, and that adoption became a major ethnic boundary marker" between them and other African ethnic groups in the Sahel and West Africa.[48] Settled and nomadic Fulani became political and warring entities, armed with horses and equipment of war from the north.[49] The wars were not merely between Fula people and other ethnic groups, but also internecine between the pastoral and sedentary Fulani, where sometimes they worked in cohesion, and other times the Muslim Fulani leaders attacked the nomadic Fulani as infidels.[49]