'You know how to win a battle, Hannibal; you do not know how to use the victory!'Livy's great history of Rome contains, in Books 21 to 30, the definitive ancient account of Hannibal's invasion of Italy in 218 BC, and the war he fought with the Romans over the following sixteen years. Livy describes the bloody siege of the Spanish city of Saguntum, Rome's ally, which sparked the war, and the Carth...