The Carthaginians continued their march and at modern Albertville they encountered the Centrones, who brought gifts and cattle for the troops. In addition, they brought hostages in order to convince Hannibal of their commitment to his cause. Hannibal was concerned and suspicious of the Centrones, though he hid this from them and the Centrones guided his army for two days. According to historian Theodore Ayrault Dodge, they marched through the Little St Bernard Pass near the village of Séez, and as they did, the pass narrowed and the Centrones turned against the Carthaginians. Some military critics, notably Napoleon, challenge that this was actually the place where the ambush took place, but the valley through which the Carthaginians were marching was the only one that could sustain a population that was capable of attacking the Carthaginian army and simultaneously sustaining the Carthaginians on their march.