Battle of Cannae required Hannibal to subdue a considerable part of the hinterland to cut the enemy's supplies and secure his own. Even after the tremendous losses suffered at Cannae and the defection of a number of her allies, Rome still had abundant manpower to prevent this and maintain considerable forces in Iberia, Sicily, Sardinia and elsewhere despite Hannibal's presence in Italy. Hannibal's conduct after the victories at Trasimene (217 BC) and Cannae, and the fact that he first attacked Rome only five years later, in 211 BC, suggests that his strategic aim was not the destruction of his foe but to dishearten
Socii to raise a double-strength army of four legions and four "alae" e.g. at the Battle of Cannae in 216 BC, where each Consul commanded an army of about 40,000 men. Polybius states that the Romans and their allies could draw on a grand total of 770,000 men fit to bear arms (of which 70,000 met the property requirement for cavalry) in 225 BC, shortly before the start of the Second Punic War. The Romans reportedly asked their allies for an urgent register of all "men fit to bear arms" for a "tumultus Gallicus". Polybius' subtotals, however, are garbled, as he