High Quality Content by WIKIPEDIA articles! The Ethiopian–Adal War was a military conflict between the Ethiopian Empire and the Adal Sultanate from 1529 until 1559. The Imam Ahmad ibn Ibrihim al-Ghazi (nicknamed Gurey in Somali and Gragn in Amharic (??? Grann), both meaning "the left-handed") came close to extinguishing the ancient realm of Ethiopia, and converting all of its subjects to Islam; the intervention of the European Cristovao da Gama, son of the famous navigator Vasco da Gama, helped to prevent this outcome. However, both polities exhausted their resources and manpower in this conflict, allowing the northward migration of the Oromo into their present homelands to the north and west of Addis Ababa. Many historians trace the origins of hostility between Somalia and Ethiopia to this war. Some historians also argue that this conflict proved, through their use on both sides, the value of firearms such as the matchlock musket, cannons, and the arquebus over traditional weapons....