Answer
The British provided military assistance to Yohannes IV, the ruler of Tigray, in his campaign against Emperor Tewodros II. Yohannes IV sought to end Tewodros II's oppressive rule and unite Ethiopia under his own leadership. With British support, Yohannes IV's forces successfully defeated Tewodros II at the Battle of Magdala in 1868, leading to Tewodros II's suicide and Yohannes IV's ascension to the Ethiopian throne.