While on the left and in the centre victory declared for the Romans, on the right wing, the 7th and 12th legions were in danger of being overwhelmed under the efforts of the whole army of the Nervii, composed of 60,000 men. These intrepid warriors, led by their chief, Boduognatus, had dashed across the Sambre in face of the escarpments of the left bank; they had boldly climbed these, and thrown themselves, in close rank, upon the two legions of the right wing. These legions were placed in a position the more critical, as the victorious movements of the left and centre, by stripping almost entirely of troops that part of the field of battle, had left them without support. The Nervii take advantage of these circumstances: some move towards the summit of the heights to seize the camp, others outflank the two legions on the right wing (_aperto latere_). As chance would have it, at this same moment, the cavalry and light-armed foot, who had been repulsed at the first attack, regained pell-mell the camp; finding themselves unexpectedly in face of the enemy, they are confounded, and take to flight again in another direction. The valets of the army, who, from the Decuman gate and the summit of the hill, had seen the Romans cross the river victoriously, and had issued forth in hope of plunder, look back; perceiving the Nervii in the camp, they fly precipitately. The tumult is further increased by the cries of the baggage-drivers, who rush about in terror. Among the auxiliaries in the Roman army, there was a body of Treviran cavalry, who enjoyed among the Gauls a reputation for valour. When they saw the camp invaded, the legions pressed and almost surrounded, the valets, the cavalry, the slingers, the Numidians, separated, dispersed, and flying on all sides, they believed that all was lost, took the road for their own country, and proclaimed everywhere in their march that the Roman army was destroyed.