At the news of so many unfavourable events, Labienus felt all the difficulties of his situation. Placed on the right bank of the Seine, he was threatened on one side by the Bellovaci, who had only to cross the Oise to fall upon him; on the other by Camulogenus, at the head of a well-trained army, ready to give battle; lastly, a large river, which he had crossed at Melun, separated him from Sens, where he had his dépôts and baggage. To escape from this perilous position, he thought it advisable to change his plans: he renounced all offensive movements, and resolved to return to his point of departure by an act of daring. Fearing that, if he went by the road on which he had advanced, he should not be able to cross the Seine at Melun, because his boats would not have re-mounted the river without difficulty, he decided on surprising the passage of the Seine below Paris, and returning to Sens by the left bank, marching over the body of the Gaulish army. Towards evening he convoked a council, and urged on his officers the punctual execution of his orders. He entrusted the boats he had brought from Melun to the Roman knights, with orders to descend the river at the end of the first watch (ten o’clock), to advance in silence for the space of four miles (six kilomètres), which would bring them as far down as the village of Point-du-Joir, and to wait for him. The five cohorts which had least experience were left in charge of the camp, and the five others of the same legion received orders to re-ascend on the right bank of the river in the middle of the night, with all their baggage, and attract by their tumult the attention of the enemy. Boats were sent in the same direction, which were rowed with great noise. He himself, a little after, left in silence with the three remaining legions, and, proceeding down the river, repaired to the spot where the first boats waited for him.
When he arrived there, a violent storm enabled him to carry by surprise the Gaulish posts placed along the whole bank. The legions and cavalry had soon passed the Seine with the assistance of the knights. Day began to appear, when the enemy learnt, almost at the same instant, first, that an unusual agitation prevailed in the Roman camp, that a considerable column of troops was ascending the river, and that in the same direction a great noise of oars was heard; lastly, that lower down the stream the troops were crossing the Seine in boats. This news made the Gauls believe that the legions intended to cross it on three points, and that, perplexed by the defection of the Ædui, they had decided on forcing the road by the left bank.[504] Camulogenus divided also his forces into three corps: he left one opposite the Roman camp; sent the second, less numerous, in the direction of Melodunum,[505] with instructions to regulate its march according to the progress of the enemy’s boats which re-ascended the Seine; and, at the head of the third, went to meet Labienus.
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]
The Gauls assume the offensive.
X. The desertion of the Ædui gave the war a greater development. Deputies are sent in all directions: credit, authority, money, everything is put in activity to excite the other states to revolt. Masters of the hostages whom Cæsar had entrusted to them, the Ædui threaten to put to death those who belong to the nations which hesitate. In a general assembly of Gaul, convoked at Bibracte, at which the Remi, the Lingones, and the Treviri only were absent, the supreme command is conferred on Vercingetorix, in spite of the opposition of the Ædui, who claim it, and who, seeing themselves rejected, begin to regret the favours they had received from Cæsar. But they had pronounced for the war, and no longer dare to separate themselves from the common cause. Eporedorix and Viridomarus, young men of great promise, obey Vercingetorix unwillingly. The latter begins by exacting from the other states hostages to be delivered on a fixed day; orders that the cavalry, amounting to 15,000 men, shall be gathered round his person; declares he has infantry enough at Bibracte, for his intention is not to offer a pitched battle to the Romans, but, with a numerous cavalry, to intercept their convoys of grain and forage. He exhorts the Gauls to set fire with a common accord to their habitations and crops, which are only small sacrifices in comparison to their liberty. These measures having been decided, he demands from the Ædui and the Segusiavi, who bordered upon the Roman province, 10,000 foot soldiers, sends them 800 horse, and gives the command of these troops to the brother of Eporedorix, with orders to carry the war into the country of the Allobroges. On another side, he orders the Gabali and the neighbouring cantons of the Arverni to march against the Helvii, and sends the Ruteni and the Cadurci to lay waste the country of the Volcæ Arecomici. At the same time, he labours secretly to gain the Allobroges, in the hope that the remembrance of their ancient struggles against the Romans is not yet effaced. He promises money to their chiefs, and to their country the sovereignty over the whole Narbonnese.
To meet these dangers, twenty-two cohorts, raised in the province, and commanded by the lieutenant Lucius Cæsar,[507] had to face the enemy on every side. The Helvii, faithful to the Romans, by their own impulse, attacked their neighbours in the open field; but repulsed with loss, and having to deplore the death of their chiefs, among others that of C. Valerius Donnotaurus, they ventured no more outside their walls. As to the Allobroges, they defended their territory with energy, by placing a great number of posts along the Rhone. The superiority of the enemy in cavalry, the interruption of the communications, the impossibility of drawing succour from Italy or the province, decided Cæsar on demanding from the German peoples on the other side of the Rhine, subdued the year before, cavalry and light infantry accustomed to fight intermingled. On their arrival, finding that the cavalry were not sufficiently well mounted, he distributed amongst them the horses of the tribunes, and even those of the Roman knights and the volunteers (evocati).[508]
Junction of Cæsar and Labienus. Battle of the Vingeanne.
XI. The line of march followed by Cæsar after he had crossed the Loire has been the subject of numerous controversies. Yet the “Commentaries” appear to us to furnish sufficient data to determine it with precision. On leaving Gergovia, Cæsar’s object was, as he tells us himself, to effect a junction with Labienus; with this view, he marched towards the land of the Senones, after having crossed the Loire at Bourbon-Lancy. On his part, Labienus, after returning to Sens, having advanced to meet Cæsar, their junction must necessarily have taken place on a point of the line from Bourbon-Lancy to Sens; this point, in our opinion, is Joigny. (See Plate 19.) Encamped not far from the confluence of the Armançon and the Yonne, Cæsar could easily receive the contingent which he expected from Germany.
The Roman army was composed of eleven legions: the 1st, lent by Pompey, and the 6th, 7th, 8th, 9th, 10th, 11th, 12th, 13th, 14th, and 15th.[509] The effective force of each of them varied from 4,000 to 5,000 men; for, if we see (lib. V. 49) that on the return from Britain two legions reckoned together only 7,000 men, their effective force was soon increased by considerable re-enforcements which came to the army of Gaul in 702;[510] the legion lent by Pompey was of 6,000 men;[511] and the 13th, at the breaking out of the civil war, had in its ranks 5,000 soldiers.[512] Cæsar had then at his disposal, during the campaigns which ended with the taking of Alesia, 50,000 legionaries, and perhaps 20,000 Numidian or Cretan archers, and 5,000 or 6,000 cavalry, a thousand of whom were Germans, making a total of about 75,000 men, without counting the valets, who were always very numerous.