For the third labor, he must capture the Cretan Bull. The Cretan Bull is really the leader of a gang of marauders. Hercules, Linus, Chiron, and an army led by Nestor stand against the gang.
In this narrative, the Cretan Bull is not just a bull but the leader of a group of bandits that Hercules must defeat in his third labor.  Hercules, along with Linus, Chiron, and an army led by Nestor, are tasked with confronting them.