resulting settlement established Bornu as an important influence over Mandara. In 1715, King Boukar received three Muslim missionaries and converted to their faith. The Mandara would largely convert to Islam over the next 200 years. Boukar also ended Bornu influence in Mandara when he defeated a Bornu expedition sometime in the late 18th or early 19th century. He launched further conquests on neighbouring groups. Fulani jihads Fulani herdsmen migrated into the territory from the west beginning in the 13th century. The earliest of these settled as minorities in pre-existing population centres, but by the 17th century, Fulani-only settlements had been established. A conversion to Islam only strengthened Fulani identity, and by 1804, population pressures were driving Fulani herdsmen to seek new territory in which to lead their cattle. Usman Dan Fodio declared a jihad in what is now northern Nigeria and Cameroon, and Modibo Adama led the charge into the land of Fumbina, which included areas of the Far North. Adama focused first on areas south. Then he turned his attentions toward the Mandara kingdom. Many soldiers who had fought Mandara in previous engagements in 1808 joined his ranks. Adama first attacked from the south and took Guider by 1810. He then took the Dulo, the Mandara capital, but the Mandarawa counterattacked and recaptured it. Bornu and Mandara allied against the Fulani invaders; meanwhile, several of Mandara's pagan vassal states rebelled. Bornu took advantage of Mandara's weakness and burnt Dulo. The Fulani took Bornu in 1845, and the weakened Mandarawa eventually fell to Fulani aggression in 1893. Adama took Maroua in battles from 1808 to 1813. The Fulani eventually came to rule the territory, with the exceptions of Mandara, Kotoko, and various Kirdi ethnic groups that had fled to the mountains and swamps. The region had been depopulated by war, slavery, and disease. Adama set up government over this new Adamawa Emirate in Yola (present-day Nigeria), answering only to the sultan of the Sokoto Empire. The Mandara Mountains and the swampy confluence of the Logone and Chari rivers supported the highest population density, as many peoples had fled the Neo-Sudanese and Fulani invasions by taking refuge on higher ground. The region was part of a lamidat ruled from Maroua. European contacts The earliest Europeans to reach the territory were British explorers Hugh Clapperton, Dixon Denham, and Dr. Walter Oudney, who were exploring the Niger River. They crossed the Sahara Desert