By 220 BC, the Via Flaminia was completed, providing the Romans with ready access to the region. However, Roman expansion was delayed for some twenty years by the Second Punic War. During the Carthaginian general Hannibal's invasion of Italy (218 BC–203 BC), Roman military control of the Pianura Padana was temporarily overthrown. Many of the recently defeated tribes (such as the Insubres and the Boii) rebelled and joined forces with Hannibal in the hope of regaining their independence.Polybius Histories III, pp. 61–71
