Oyo Empire culture in Oyo where victory was obligatory and defeat carried the duty of committing suicide. This do-or-die policy no doubt contributed to the military aggressiveness of Oyo's generals. The Oyo Empire was the only Yoruba state to adopt cavalry; it did so because most of its territory was in the northern savannah. The origin of the cavalry is disputed; however, the Nupe, Borgu and Hausa in neighboring territories also used cavalry and may have had the same historical source. Oyo was able to purchase horses from the north and maintain them in metropolitan Oyo because of partial freedom from the
History of the Kingdom of Dahomey was a significant succession fight after Agaja's death when the recognized heir was passed over for Tegbessou (who ruled from 1740-1774). Tegbessou moved the capital city back to Abomey but had to deal with a number of different factions in the powerful members of the kingdom and in keeping conquered territories loyal. At the same time, the empire continued slave raids throughout the region and became a major supplier to the Atlantic slave trade. In the late 18th century, Oyo put pressure onto Dahomey to reduce its participation in the slave trade (largely to protect its own slave trade) and