The Romans followed up and captured Tunis, only from Carthage. From Tunis the Romans raided and devastated the immediate area around Carthage. In despair, the Carthaginians sued for peace but Regulus offered such harsh terms that the Carthaginians decided to fight on. Charge of the training of their army was given to the Spartan mercenary commander Xanthippus. In 255 BC Xanthippus led an army of 12,000 infantry, 4,000 cavalry and 100 elephants against the Romans and defeated them at the Battle of Tunis. Approximately 2,000 Romans retreated to Aspis; 500, including Regulus, were captured; the rest were killed. Xanthippus, fearful of the envy of the Carthaginian generals he had outdone, took his pay and returned to Greece. The Romans sent a fleet to evacuate their survivors. It was intercepted by a Carthaginian fleet off Cape Bon (in the north east of modern Tunisia) and in the Battle of Cape Hermaeum the Carthaginians were heavily defeated, losing 114 ships captured. The Roman fleet was devastated by a storm while returning to Italy, with 384 ships sunk from their total of 464 and 100,000 men lost, the majority non-Roman Latin allies. It is possible that the presence of the made the Roman ships unusually unseaworthy; there is no record of them being used after this disaster.