But in the eastern cantons the national feeling was more energetically roused. The Viromandui (about Arras), the Atrebates (about St. Quentin), the German Aduatuci (about Namur), but above all the Nervii (in Hainault) with their not inconsiderable body of clients, little inferior in number to the Suessiones and Bellovaci, far superior to them in valour and vigorous patriotic spirit, concluded a second and closer league, and assembled their forces on the upper Sambre. Celtic spies informed them most accurately of the movements of the Roman army; their own local knowledge, and the high tree-barricades which were formed everywhere in these districts to obstruct the bands of mounted robbers who often visited them, allowed the allies to conceal their own operations for the most part from the view of the Romans. When these arrived on the Sambre not far from Bavay, and the legions were occupied in pitching their camp on the crest of the left bank, while the cavalry and light infantry were exploring the opposite heights, the latter were all at once assailed by the whole mass of the enemy's forces and driven down the hill into the river. In a moment the enemy had crossed this also, and stormed the heights of the left bank with a determination that braved death. Scarcely was there time left for the entrenching legionaries to exchange the mattock for the sword; the soldiers, many without helmets, had to fight just as they stood, without line of battle, without plan, without proper command; for, owing to the suddenness of the attack and the intersection of the ground by tall hedges, the several divisions had wholly lost their communications. Instead of a battle there arose a number of unconnected conflicts. Labienus with the left wing overthrew the Atrebates and pursued them even across the river. The Roman central division forced the Viromandui down the declivity. But the right wing, where the general himself was present, was outflanked by the far more numerous Nervii the more easily, as the central division carried away by its own success had evacuated the ground alongside of it, and even the half-ready camp was occupied by the Nervii; the two legions, each separately rolled together into a dense mass and assailed in front and on both flanks, deprived of most of their officers and their best soldiers, appeared on the point of being broken and cut to pieces. The Roman camp-followers and the allied troops were already fleeing in all directions; of the Celtic cavalry whole divisions, like the contingent of the Treveri, galloped off at full speed, that from the battle-field itself they might announce at home the welcome news of the defeat which had been sustained. Everything was at stake. The general himself seized his shield and fought among the foremost; his example, his call even now inspiring enthusiasm, induced the wavering ranks to rally. They had already in some measure extricated themselves and had at least restored the connection