Gallic War (4.13-4.17)

After this engagement, Caesar considered that neither ought embassadors to be received to audience, nor conditions be accepted by him from those who, after having sued for peace by way of stratagem and treachery, had made war without provocation. And to wait until the enemy's forces were augmented and their cavalry had returned, he concluded, would be the greatest madness; and knowing the fickleness of the Gauls, he felt how much influence the enemy had already acquired among them by this one skirmish. He [therefore] deemed that no time for concerting measures ought to be afforded them. After having resolved on those things and communicated his plans to his lieutenants and quaestor in order that he might not suffer any opportunity for engaging to escape him, a very seasonable event occurred, namely, that on the morning of the next day, a large body of Germans, consisting of their princes and old men, came to the camp to him to practice the same treachery and dissimulation; but, as they asserted, for the purpose of acquitting themselves for having engaged in a skirmish the day before, contrary to what had been agreed and to what indeed, they themselves had requested; and also if they could by any means obtain a truce by deceiving him. Caesar, rejoicing that they had fallen into his power, ordered them to be detained. He then drew all his forces out of the camp, and commanded the cavalry, because he thought they were intimidated by the late skirmish, to follow in the rear.

Having marshalled his army in three lines, and in a short time performed a march of eight miles, he arrived at the camp of the enemy before the Germans could perceive what was going on; who being suddenly alarmed by all the circumstances, both by the speediness of our arrival and the absence of their own officers, as time was afforded neither for concerting measures nor for seizing their arms, are perplexed as to whether it would be better to lead out their forces against the enemy, or to defend their camp, or seek their safety by flight. Their consternation being made apparent by their noise and tumult, our soldiers, excited by the treachery of the preceding day, rushed into the camp: such of them as could readily get their arms, for a short time withstood our men, and gave battle among their carts and baggage wagons; but the rest of the people, [consisting] of boys and women (for they had left their country and crossed the Rhine with all their families) began to fly in all directions; in pursuit of whom Caesar sent the cavalry.

The Germans when, upon hearing a noise behind them, [they looked and] saw that their families were being slain, throwing away their arms and abandoning their standards, fled out of the camp, and when they had arrived at the confluence of the Meuse and the Rhine , the survivors despairing of further escape, as a great number of their countrymen had been killed, threw themselves into the river and there perished, overcome by fear, fatigue, and the violence of the stream. Our soldiers, after the alarm of so great a war, for the number of the enemy amounted to 430,000, returned to their camp, all safe to a man, very few being even wounded. Caesar granted those whom he had detained in the camp liberty of departing. They however, dreading revenge and torture from the Gauls, whose lands they had harassed, said that they desired to remain with him. Caesar granted them permission.

The German war being finished, Caesar thought it expedient for him to cross the Rhine , for many reasons; of which this was the most weighty, that, since he saw the Germans were so easily urged to go into Gaul, he desired they should have their fears for their own territories, when they discovered that the army of the Roman people both could and dared pass the Rhine . There was added also, that portion of the cavalry of the Usipetes and the Tenchtheri, which I have above related to have crossed the Meuse for the purpose of plundering and procuring forage, and was not present at the engagement, had betaken themselves, after the retreat of their countrymen, across the Rhine into the territories of the Sigambri, and united themselves to them. When Caesar sent embassadors to them, to demand that they should give up to him those who had made war against him and against Gaul, they replied, "That the Rhine bounded the empire of the Roman people; if he did not think it just for the Germans to pass over into Gaul against his consent, why did he claim that any thing beyond the Rhine should be subject to his dominion or power?" The Ubii, also, who alone, out of all the nations lying beyond the Rhine , had sent embassadors to Caesar, and formed an alliance and given hostages, earnestly entreated "that he would bring them assistance, because they were grievously oppressed by the Suevi; or, if he was prevented from doing so by the business of the commonwealth, he would at least transport his army over the Rhine ; that that would be sufficient for their present assistance and their hope for the future; that so great was the name and the reputation of his army, even among the most remote nations of the Germans, arising from the defeat of Ariovistus and this last battle which was fought, that they might be safe under the fame and friendship of the Roman people." They promised a large number of ships for transporting the army.

Caesar, for those reasons which I have mentioned, had resolved to cross the Rhine ; but to cross by ships he neither deemed to be sufficiently safe, nor considered consistent with his own dignity or that of the Roman people. Therefore, although the greatest difficulty in forming a bridge was presented to him, on account of the breadth, rapidity, and depth of the river, he nevertheless considered that it ought to be attempted by him, or that his army ought not otherwise to be led over. He devised this plan of a bridge. He joined together at the distance of two feet, two piles, each a foot and a half thick, sharpened a little at the lower end, and proportioned in length, to the depth of the river. After he had, by means of engines, sunk these into the river, and fixed them at the bottom, and then driven them in with rammers, not quite perpendicularly, like a stake, but bending forward and sloping, so as to incline in the direction of the current of the river; he also placed two [other piles] opposite to these, at the distance of forty feet lower down, fastened together in the same manner, but directed against the force and current of the river. Both these, moreover, were kept firmly apart by beams two feet thick (the space which the binding of the piles occupied), laid in at their extremities between two braces on each side, and in consequence of these being in different directions and fastened on sides the one opposite to the other, so great was the strength of the work, and such the arrangement of the materials, that in proportion as the greater body of water dashed against the bridge, so much the closer were its parts held fastened together. These beams were bound together by timber laid over them, in the direction of the length of the bridge, and were [then] covered over with laths and hurdles; and in addition to this, piles were driven into the water obliquely, at the lower side of the bridge, and these, serving as buttresses, and being connected with every portion of the work, sustained the force of the stream: and there were others also above the bridge, at a moderate distance; that if trunks of trees or vessels were floated down the river by the barbarians for the purpose of destroying the work, the violence of such things might be diminished by these defenses, and might not injure the bridge.