The Battle of Wayna Daga (Amharic for "grape-cultivating altitude") occurred on 21 February 1543 east of Lake Tana in Ethiopia. Led by the Emperor Galawdewos, the combined army of Ethiopian and Portuguese troops defeated the Adal-Ottoman army led by Imam Ahmad ibn Ibrahim al-Ghazi. Tradition states that Ahmad was killed by a Portuguese musketeer, who had charged alone into the Muslim lines. Once the Imam's soldiers learned of his death, they fled the battlefield.

• http://en.wikipedia.org/wiki/Battle of Wayna Daga