Cannæ, ancient town in Apulia, near the mouth of the Aufidus, where Hannibal, in a great battle, defeated the Romans in 216 B.C., but failing to follow up his success by a march on Rome, was twitted by Maherbal, one of his officers, who addressing him said, "You know how to conquer, Hannibal, but not how to profit by your victory."