The Battle of Derasge was fought on 9 February 1855 between Kassa Hailu's forces and the forces of Wube Haile Maryam, Dejazmatch of Tigray. Kassa won the battle, and two days later was crowned Tewodros II of Ethiopia at the church of Derasge Mariam near Mekane Berhan.
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Text from the Wikipedia article “Battle of Derasge”, available under CC BY-SA 4.0.