The first quarter of the year 58 was consumed in preparations. Caesar’s antagonists in the Senate were still raving against the acts of his consulship, threatening him with impeachment for neglecting Bibulus’s interpellations, charging him with impiety for disregarding the weather, and clamoring for the suppression of his command. But Cicero’s banishment damped the ardor of these gentlemen; after a few vicious efforts, they subsided into sullenness, and trusted to Ariovistus or the Helvetii to relieve them of their detested enemy. Caesar himself selected his officers. Cicero having declined to go as his lieutenant, he had chosen Labienus, who had acted with him, when tribune, in the prosecution of Rabirius, and had procured him the pontificate by giving the election to the people. Young men of rank in large numbers had forgotten party feeling, and had attached themselves to the expedition as volunteers to learn military experience. His own equipments were of the simplest. No common soldier was more careless of hardships than Caesar. His chief luxury was a favorite horse, which would allow no one but Caesar to mount him; a horse which had been bred in his own stables, and, from the peculiarity of a divided hoof, had led the augurs to foretell wonders for the rider of it. His arrangements were barely completed when news came in the middle of March that the Helvetii were burning their towns and villages, gathering their families into their wagons, and were upon the point of commencing their emigration. Their numbers, according to a register which was found afterward, were 368,000, of whom 92,000 were fighting men. They were bound for the West; and there were two roads, by one or other of which alone they could leave their country. One was on the right bank of the Rhone by the Pas de l’Ecluse, a pass between the Jura mountains and the river, so narrow that but two carts could go abreast along it; the other, and easier, was through Savoy, which was now Roman.
Under any aspect the transit of so vast a body through Roman territory could not but be dangerous. Savoy was the very ground on which Longinus had been destroyed. Yet it was in this direction that the Helvetii were preparing to pass, and would pass unless they were prevented; while in the whole Transalpine province there was but a single legion to oppose them. Caesar started on the instant. He reached Marseilles in a few days, joined his legion, collected a few levies in the Province, and hurried to Geneva. Where the river leaves the lake there was a bridge which the Helvetii had neglected to occupy. Caesar broke it, and thus secured a breathing time. The Helvetii, who were already on the move and were assembling in force a few miles off, sent to demand a passage. If it was refused, there was more than one spot between the lake and the Pas de l’Ecluse where the river could be forded. The Roman force was small, and Caesar postponed his reply.
It was the 1st of April; he promised an answer on the 15th. In the interval he threw up forts, dug trenches, and raised walls at every point where a passage could be attempted; and when the time was expired, he declined to permit them to enter the Province. They tried to ford; they tried boats; but at every point they were driven back. It remained for them to go by the Pas de l’Ecluse. For this route they required the consent of the Sequani; and, however willing the Sequani might be to see them in their neighbors’ territories, they might object to the presence in their own of such a flight of devouring locusts. Evidently, however, there was some general scheme, of which the entry of the Helvetii into Gaul was the essential part; and through the mediation of Dumnorix, an Aeduan and an ardent patriot, the Sequani were induced to agree.
The Province had been saved, but the exodus of the enormous multitude could no longer be prevented. If such waves of population were allowed to wander at pleasure, it was inevitable that sooner or later they would overflow the borders of the Empire. Caesar determined to show, at once and peremptorily, that these movements would not be permitted without the Romans’ consent. Leaving Labienus to guard the forts on the Rhone, he hurried back to Italy, gathered up his three legions at Aquileia, raised two more at Turin with extreme rapidity, and returned with them by the shortest route over the Mont Genèvre. The mountain tribes attacked him, but could not even delay his march. In seven days he had surmounted the passes, and was again with Labienus.
The Helvetii, meanwhile, had gone through the Pas de l’Ecluse, and were now among the Aedui, laying waste the country. It was early in the summer. The corn was green, the hay was still uncut, and the crops were being eaten off the ground. The Aedui threw themselves on the promised protection of Rome. Caesar crossed the Rhone above Lyons, and came up with the marauding hosts as they were leisurely passing in boats over the Saône. They had been twenty days upon the river, transporting their wagons and their families. Three quarters of them were on the other side. The Tigurini from Zurich, the most warlike of their tribes, were still on the left bank. The Tigurini had destroyed the army of Longinus, and on them the first retribution fell. Caesar cut them to pieces. A single day sufficed to throw a bridge over the Saône, and the Helvetii, who had looked for nothing less than to be pursued by six Roman legions, begged for peace. They were willing, they said, to go to any part of the country which Caesar would assign to them; and they reminded him that they might be dangerous if pushed to extremities. Caesar knew that they were dangerous. He had followed them because he knew it. He said that they must return the way that they had come. They must pay for the injuries which they had inflicted on the Aedui, and they must give him hostages for their obedience. The fierce mountaineers replied that they had been more used to demand hostages than to give them; and confident in their numbers, and in their secret allies among the Gauls, they marched on through the Aeduan territories up the level banks of the Saône, thence striking west toward Autun.
Caesar had no cavalry; but every Gaul could ride, and he raised a few thousand horse among his supposed allies. These he meant to employ to harass the Helvetian march; but they were secret traitors, under the influence of Dumnorix, and they fled at the first encounter. The Helvetii had thus the country at their mercy, and they laid it waste as they went, a day’s march in advance of the Romans. So long as they kept by the river, Caesar’s stores accompanied him in barges. He did not choose to let the Helvetii out of his sight, and when they left the Saône, and when he was obliged to follow, his provisions ran short. He applied to the Aeduan chiefs, who promised to furnish him, but they failed to do it. Ten days passed, and no supplies came in. He ascertained at last that there was treachery. Dumnorix and other Aeduan leaders were in correspondence with the enemy. The cavalry defeat and the other failures were thus explained. Caesar, who trusted much to gentleness and to personal influence, was unwilling to add the Aeduii to his open enemies. Dumnorix was the brother of Divitiacus, the reigning chief, whom Caesar had known in Rome. Divitiacus was sent for, confessed with tears his brother’s misdeeds, and begged that he might be forgiven. Dumnorix was brought in. Caesar showed that he was aware of his conduct; but spoke kindly to him, and cautioned him for the future. The corn-carts, however, did not appear; supplies could not be dispensed with; and the Romans, leaving the Helvetii, struck off to Bibracte, on Mont Beauvray, the principal Aeduan town in the highlands of Nivernais. Unfortunately for themselves, the Helvetii thought the Romans were flying, and became in turn the pursuers. They gave Caesar an opportunity, and a single battle ended them and their migrations. The engagement lasted from noon till night. The Helvetii fought gallantly, and in numbers were enormously superior; but the contest was between skill and courage, sturdy discipline and wild valor; and it concluded as such contests always must. In these hand-to-hand engagements there were no wounded. Half the fighting men of the Swiss were killed; their camp was stormed; the survivors, with the remnant of the women and children, or such of them as were capable of moving (for thousands had perished, and little more than a third remained of those who had left Switzerland), straggled on to Langres, where they surrendered. Caesar treated the poor creatures with kindness and care. A few were settled in Gaul, where they afterward did valuable service. The rest were sent back to their own cantons, lest the Germans should take possession of their lands; and lest they should starve in the homes which they had desolated before their departure, they were provided with food out of the Province till their next crops were grown.
A victory so complete and so unexpected astonished the whole country. The peace party recovered the ascendency. Envoys came from all the Gaulish tribes to congratulate, and a diet of chiefs was held under Caesar’s presidency, where Gaul and Roman seemed to promise one another eternal friendship. As yet, however, half the mischief only had been dealt with, and that the lighter part. The Helvetii were disposed of, but the Germans remained; and till Ariovistus was back across the Rhone, no permanent peace was possible. Hitherto Caesar had only received vague information about Ariovistus. When the diet was over, such of the chiefs as were sincere in their professions came to him privately and explained what the Germans were about. A hundred and twenty thousand of them were now settled near Belfort, and between the Vosges and the Rhine, with the connivance of the Sequani. More were coming, and in a short time Gaul would be full of them. They had made war on the Aedui; they were in correspondence with the anti-Roman factions; their object was the permanent occupation of the country.
Two months still remained of summer. Caesar was now conveniently near to the German positions. His army was in high spirits from its victory, and he himself was prompt in forming resolutions and swift in executing them. An injury to the Aedui could be treated as an injury to the Romans, which it would be dishonor to pass over. If the Germans were allowed to overrun Gaul, they might soon be seen again in Italy.
Ariovistus was a “friend of Rome.” Caesar had been himself a party to the conferring this distinction upon him. As a friend, therefore, he was in the first instance to be approached. Caesar sent to invite him to a conference. Ariovistus, it seemed, set small value upon his honors. He replied that if he needed anything from Caesar, he would go to Caesar and ask for it. If Caesar required anything from him, Caesar might do the same. Meanwhile Caesar was approaching a part of Gaul which belonged to himself by right of conquest, and he wished to know the meaning of the presence of a Roman army there.
After such an answer, politeness ceased to be necessary. Caesar rejoined that since Ariovistus estimated so lightly his friendship with the Romans as to refuse an amicable meeting, he would inform him briefly of his demands upon him. The influx of Germans on the Rhine must cease: no more must come in. He must restore the hostages which he had taken from the Aedui, and do them no further hurt. If Ariovistus complied, the Romans would continue on good terms with him. If not, he said that by a decree of the Senate the Governor of Gaul was ordered to protect the Aedui, and he intended to do it.