For his part, the author of Wafayāt reports that:
The Emir of the Muslims rode on his horse, surrounded by the elements of his cavalry, his Sanhādja and his tribal chiefs. They rode towards Alfonso's camp, on which they fell, entered and killed his defenders. [...] The Christians returned to their camp as soon as they knew that the Emir was there. Yūsuf ibn Tāshfin rushed at them to keep them away. Then he came back and drove them away. They pursued him, but he escaped. Attacks continued on both sides until the Amir of the Muslims ordered his Sudanese guard, hashamahu al-Sūdān, to intervene. About four thousand of them went ashore. They threw themselves into battle, armed with their lamt shields, Indian swords and al-zān javelins. They struck the enemy cavalry with their lances, piercing their horsemen who retreated with their arrows in terror. Alfonso ran at a black slave who had exhausted all his arrows. He tried to hit him with a sword, but the Sudanese grabbed him and grabbed the reins of his mount. He pulled a dagger from his belt and stuck it in his thigh, splitting the straps of his chain mail and ripping off a piece of his saddle. Thus, the glimmer of victory came in the middle of the day. God restored the hearts of Muslims and made his religion triumph (Ibn Khallikān, op. cit., vol. VII, p. 118).