The mercenary general Xanthippus was hired by the city of Carthage following heavy-handed negotiations by Rome. He made the Romans fight on open ground, which allowed him to maximize the effect of the excellent Carthaginian cavalry and elephants. The Roman army under Marcus Atilius Regulus was based at Tunis. Faced by the resurgent Carthaginian army Regulus was keen to gain another victory rather than risk the chance that someone else would get the glory of eventual victory. All we have from the sources is Polybios' report that Regulus had 15,000 Infantry and 500 Cavalry when he returned home.