The battle between Marcellus and Constantine's forces turned into a slaughter. In reality, Marcellus was unaware of how much the usurper's forces had been drained during his failed bid to invade Hispania. Thus, he was vastly over-prepared for this so-called campaign.
However, Marcellus did not expect that Constantine would send his army to their deaths, and used the resulting chaos to escape. As a matter of fact, the emperor was furious when he found out that Constantine had slipped from his grasp. Though he did not immediately know how the man had accomplished it, he had quickly sent word to all fifty-four thousand men in his army to scour the nearby mountains for any sign of the man.