In the early summer of 216 the Consuls concentrated their forces at CANNAE, a hamlet near the mouth of the Aufidus. Early one morning in June the Romans massed their troops on the left bank of the river, with their cavalry on either wing, the right under Paullus, and the left under Varro. The Proconsul Servilius commanded the centre. The Carthaginians were drawn up in the form of a crescent, flanked by cavalry. Both armies advanced to the attack at the same time. The onset was terrible; but though the Romans fought with a courage increased by the thought that their homes, wives, and children were at stake, they were overwhelmed on all sides. Seventy thousand fell on the field, among whom were Paullus, Servilius, many officers, and eighty men of senatorial rank. This was the most crushing defeat ever experienced by the Romans. All Southern Italy, except the Latin colonies and the Greek cities on the coast, went over to Hannibal. CHAPTER XV. THE SECOND PUNIC WAR.-FROM CANNAE TO THE BATTLE OF ZAMA (216-202). ROME was appalled; but though defeated, she was not subdued. All the Latin allies were summoned for aid in the common peril. Boys and old men alike took up arms even the slaves were promised freedom if they would join the ranks. Hannibal marched from Cannae into Campania. He induced Capua, the second city of Italy, to side with him. But his expectations that other cities would follow her example were not fulfilled. He went into winter quarters here (215-214). The Capuans, notorious for their luxurious and effeminate habits, are said to have injured his soldiers. But Hannibal's superiority as a general is unquestionable, and his want of success after this was due to insufficient aid from home, and to the fact that the resources of Rome were greater than those of Carthage. The Latin allies of Rome had remained true to their allegiance, and only one city of importance was under his control. It was an easy matter to conquer the enemy in open battle, but to support his own army was more difficult, for all Italy had been devastated. On the other hand, the Romans were well supplied with food from their possessions in Sicily. Hannibal saw, therefore, that more active measures than those already employed were necessary. He sent to Carthage an appeal for aid. He formed an alliance with Philip V. of Macedonia, and earnestly urged Hasdrubal Baroa, his lieutenant in Spain, to come to his assistance. He hoped, with this army from the north, with supplies and reinforcements from Carthage, and with such troops as he might obtain from Macedonia, to concentrate a large force at Rome and compel her into submission.