The Cid and the king of Zaragoza, setting out from Monzón, perpetrated a five-day raid on Aragon, according to the Historia Roderici.
The Cid then targeted the southeast of the Taifa of Tortosa, ravaging the territory around Morella, even refortifying the castle at Olocau.
Sancho, who had avoided confrontation during the raid on his own kingdom, joins with Mundhir al-Hayib, the ruler of the united realms of Denia, Lleida, and Tortosa, and camped by the Ebro.
The Cid reportedly replied to the king's demand that he retire with an uncompromising message, and when the two armies join in battle the former scored "an overwhelming victory" in mid-August, probably August 14.
The aforementioned Historia adds that the Cid chased his fleeing Christian enemies and took two thousand Aragonese and Navarrese prisoner.
The Cid also sacks Sancho's camp and carries an enormous booty back to Zaragoza.
He is even greeted by celebrant Zaragozans at Fuentes some distance away.
