Abyssinian–Adal war: The Adal Sultanate seizes southern Ethiopia.

The Ethiopian–Adal War, also known as the Abyssinian–Adal War and Futūḥ Al-Ḥabaša, was a war fought between the Christian Ethiopian Empire and the Muslim Adal Sultanate from 1529 to 1543. The Christian Ethiopian troops consisted of the Amhara, Tigrayans, Tigrinya and Agaw people, and at the closing of the war, supported by the Portuguese Empire with no less than four hundred musketeers. The Adal forces were composed of Harla/Harari, Somali, Afar, as well as Arab and Turkish gunmen. Both sides would see the Maya mercenaries at times join their ranks. The conflict was followed shortly by the 16th century Ottoman-Ethiopian War

The Adal Sultanate, also known as the Adal Empire or Barr Saʿad dīn, was a medieval Sunni Muslim empire which was located in the Horn of Africa. It was founded by Sabr ad-Din III on the Harar plateau in Adal after the fall of the Sultanate of Ifat. The kingdom flourished c. 1415 to 1577. At its height, the polity under Sultan Badlay controlled the territory stretching from Cape Guardafui in Somalia to the port city of Suakin in Sudan.

The Battle of Amba Sel was fought on 28 October 1531, between the Ethiopians under their Emperor Dawit II, and the forces of Imam Ahmad ibn Ibrahim al-Ghazi of the Adal Sultanate.