Gallic War (1.46-1.50)

While these things are being transacted in the conference it was announced to Caesar that the cavalry of Ariovistus were approaching nearer the mound, and were riding up to our men, and casting stones and weapons at them. Caesar made an end of his speech and betook himself to his men; and commanded them that they should by no means return a weapon upon the enemy. For though he saw that an engagement with the cavalry would be without any danger to his chosen legion, yet he did not think proper to engage, lest, after the enemy were routed, it might be said that they had been insnared by him under the sanction of a conference. When it was spread abroad among the common soldiery with what haughtiness Ariovistus had behaved at the conference, and how he had ordered the Romans to quit Gaul, and how his cavalry had made an attack upon our men, and how this had broken off the conference, a much greater alacrity and eagerness for battle was infused into our army.

Two days after, Ariovistus sends embassadors to Caesar, to state "that he wished to treat with him about those things which had been begun to be treated of between them, but had not been concluded;" [and to beg] that "he would either again appoint a day for a conference; or, if he were not willing to do that, that he would send one of his [officers] as an embassador to him." There did not appear to Caesar any good reason for holding a conference; and the more so as the day before the Germans could not be restrained from casting weapons at our men. He thought he should not without great danger send to him as embassador one of his [Roman] officers, and should expose him to savage men. It seemed [therefore] most proper to send to him C. Valerius Procillus, the son of C. Valerius Caburus, a young man of the highest courage and accomplishments (whose father had been presented with the freedom of the city by C. Valerius Flaccus), both on account of his fidelity and on account of his knowledge of the Gallic language, which Ariovistus, by long practice, now spoke fluently; and because in his case the Germans would have no motive for committing violence; and [as his colleague] M. Mettius, who had shared the hospitality of Ariovistus. He commissioned them to learn what Ariovistus had to say, and to report to him. But when Ariovistus saw them before him in his camp, he cried out in the presence of his army, "Why were they come to him? Was it for the purpose of acting as spies?" He stopped them when attempting to speak, and cast them into chains.

The same day he moved his camp forward and pitched under a hill six miles from Caesar's camp. The day following he led his forces past Caesar's camp, and encamped two miles beyond him; with this design that he might cut off Caesar from the corn and provisions, which might be conveyed to him from the Sequani and the Aedui. For five successive days from that day, Caesar drew out his forces before the camp, and put them in battle order, that, if Ariovistus should be willing to engage in battle, an opportunity might not be wanting to him. Ariovistus all this time kept his army in camp: but engaged daily in cavalry skirmishes. The method of battle in which the Germans had practiced themselves was this. There were 6,000 horse, and as many very active and courageous foot, one of whom each of the horse selected out of the whole army for his own protection. By these [foot] they were constantly accompanied in their engagements; to these the horse retired; these on any emergency rushed forward; if any one, upon receiving a very severe wound, had fallen from his horse, they stood around him: if it was necessary to advance further than usual, or to retreat more rapidly, so great, from practice, was their swiftness, that, supported by the manes of the horses, they could keep pace with their speed.

Perceiving that Ariovistus kept himself in camp, Caesar, that he might not any longer be cut off from provisions, chose a convenient position for a camp beyond that place in which the Germans had encamped, at about 600 paces from them, and having drawn up his army in three lines, marched to that place. He ordered the first and second lines to be under arms; the third to fortify the camp. This place was distant from the enemy about 600 paces, as has been stated. Thither Ariovistus sent light troops, about 16,000 men in number, with all his cavalry; which forces were to intimidate our men, and hinder them in their fortification. Caesar nevertheless, as he had before arranged, ordered two lines to drive off the enemy: the third to execute the work. The camp being fortified, he left there two legions and a portion of the auxiliaries; and led back the other four legions into the larger camp.

The next day, according to his custom, Caesar led out his forces from both camps, and having advanced a little from the larger one, drew up his line of battle, and gave the enemy an opportunity of fighting. When he found that they did not even then come out [from their intrenchments,] he led back his army into camp about noon. Then at last Ariovistus sent part of his forces to attack the lesser camp. The battle was vigorously maintained on both sides till the evening. At sunset, after many wounds had been inflicted and received, Ariovistus led back his forces into camp. When Caesar inquired of his prisoners, wherefore Ariovistus did not come to an engagement, he discovered this to be the reason-that among the Germans it was the custom for their matrons to pronounce from lots and divination, whether it were expedient that the battle should be engaged in or not; that they had said, "that it was not the will of heaven that the Germans should conquer, if they engaged in battle before the new moon."