Hannibal Crosses the Alps

In autumn of 218 BCE, the Carthaginian general Hannibal Barca led a large army, including war elephants, over the Alps and into northern Italy. The crossing was one of the most daring military feats of the ancient world. It opened the Second Punic War on Roman soil and began a campaign that brought Rome closer to defeat than at any other point in its rise.

The background lay in the long rivalry between Rome and Carthage, the Phoenician-founded power based in North Africa. Rome had won the First Punic War (264-241 BCE), taking Sicily and imposing a heavy indemnity on Carthage. Carthage then expanded its influence in Iberia under Hannibal's father, Hamilcar, and his successors. Tensions rose over the Iberian city of Saguntum, which had ties to Rome and fell to Hannibal after a siege. Rome demanded redress, Carthage refused, and war followed. Ancient writers such as Polybius and Livy, both writing from a Roman-oriented perspective, say Hannibal had sworn lifelong enmity toward Rome.

Rather than meet Rome at sea, where it was strong, Hannibal marched overland from New Carthage in Iberia, crossed the Pyrenees, and moved through southern Gaul. He crossed the Rhône, evading a Roman force sent to intercept him, and then headed up toward the mountains. The Alpine crossing came late in the season, with snow already on the high passes. Ancient accounts describe hostile local tribes, ambushes, narrow tracks, landslides and bitter cold. Polybius, who is generally considered the more reliable source, says Hannibal arrived with roughly 20,000 infantry and 6,000 cavalry, far fewer than he started with. The figure of 40,000 is sometimes quoted for the force at the outset, but all such numbers are estimates.

Exactly which pass he used is still debated. Candidates include the Col du Clapier, the Col de la Traversette, and several others, and no consensus has emerged. The fate of the elephants is also unclear. Some survived the crossing, but most seem to have died in the following months.

The consequences were swift. Hannibal's exhausted army defeated Roman forces at the Ticinus and the Trebia in late 218 BCE, then won major victories at Lake Trasimene in 217 and Cannae in 216. Several Italian communities defected to him. Yet Rome refused to negotiate, rebuilt its armies, and avoided another large pitched battle for years. Hannibal remained in Italy for over a decade without capturing Rome. The war was ultimately decided when the Roman general Scipio Africanus carried the fight to Africa, defeating Hannibal at Zama in 202 BCE. The Alpine crossing endures as a symbol of strategic boldness and endurance.