Oyo Empire gunshots scared the Oyo cavalry horses and prevented their charging. Dahomey's army also built fortifications such as trenches, which forced the Oyo army to fight as infantry. The battle lasted four days, but the Yoruba were eventually victorious after reinforcements arrived. Dahomey was forced to pay tribute to Oyo. The Yoruba invaded Dahomey seven times before finally subjugating the small kingdom in 1748. With its cavalry, Oyo campaigned successfully in conquest and suppression over great distances. The Oyo army was able to attack defensive fortifications, but it was harder to supply an army, and they withdrew when supplies ran out.
Nupe people Nupe people The Nupe, traditionally called the Tapa by the neighbouring Yoruba, are an ethnic group located primarily in the Middle Belt and northern Nigeria, and are the dominant group in Niger State, an important minority in Kwara State and present in Kogi State as well. The Nupe trace their origin to Tsoede who fled the court of Idah and established a loose confederation of towns along the Niger in the 15th century. The proximity of Nupe to the Yoruba Igbomina people in the south and to the Yoruba Oyo people in the southwest led to cross-fertilization of cultural influences