At sunrise the Roman troops had crossed the river, and the enemy’s army appeared drawn up in order of battle. Labienus exhorts his soldiers to recall to mind their ancient valour, and so many glorious exploits, and, as they marched to the combat, to consider themselves under the eye of Cæsar, who had led them so often to victory: he then gives the signal. At the first shock the 7th legion, placed on the right wing, routs the enemy; but on the left wing, although the 12th legion had transpierced the first ranks with their _pila_, the Gauls defend themselves obstinately, and not one dreams of flight. Camulogenus, in the midst of them, excites their ardour. The victory was still doubtful, when the tribunes of the 7th legion, informed of the critical position of the left wing, lead their soldiers to the back of the enemies, and take them in the rear. The barbarians are surrounded, yet not one yields a step; all die fighting, and Camulogenus perishes with the rest. The Gaulish troops left opposite the camp of Labienus had hurried forward at the first news of the combat, and had taken possession of a hill (probably that of Vaugirard); but they did not sustain the attack of the victorious Romans, and were hurried along in the general rout; all who would not find refuge in the woods and on the heights were cut to pieces by the cavalry. After this battle Labienus returned to Agedincum; thence he marched with all his troops, and went to join Cæsar.[506] [Sidenote: The Gauls assume the offensive.]