Hannibal led a large Carthaginian army from Iberia, through Gaul, over the Alps and invaded mainland Italy in 218 BC. During the next three years Hannibal inflicted heavy defeats on the Romans at the battles of the Trebia, Lake Trasimene and Cannae. At the last of these alone, at least 67,500 Romans were killed or captured. The historian Toni Ñaco del Hoyo describes these as "great military calamities", and Brian Carey writes that they brought Rome to the brink of collapse. Hannibal's army campaigned in Italy for 14 years before the survivors withdrew.
