The camp was lightly guarded because Nicanor thought Seleucus had fled, it was also separated from the main force who had yet to cross the river; seeing the opportunity Seleucus attacked him during the night, and caught Nicanor by surprise, amidst the fight, Eaugoras was killed and his Persian soldiers fled the battlefield or surrendered to Seleucus, Nicanor army was overwhelmed, but he was able ot escape.