Two days afterwards, Ariovistus made a proposal for a renewal of the conference, or for the sending to him of one of Cæsar's lieutenants. Cæsar refused, the more so because, the day before, the Germans had again advanced and thrown their missiles at the Romans, and that thus his lieutenant would not have been safe from the attacks of the barbarians. He thought it more prudent to send as his deputy Valerius Procillus, the son of a Gaul who had become a Roman citizen, who spoke the Celtic language, and who was on familiar terms with Ariovistus, and M. Mettius, with whom the German king was bound by the rights of hospitality. They had hardly entered the camp of Ariovistus, when he ordered them to be thrown into fetters, under pretence that they were spies.[222]
VII. The same day, the German king broke up his camp and took another position at the foot of the Vosges (_sub monte_), at a distance of 6,000 paces from that of Cæsar, between Soultz and Feldkirch, not far from the Lauch. (_See Plate 6._) Next day he crossed the Thur, near its confluence with the Ill, ascended the left banks of the Ill and the Doller, and only halted at Reiningen, after having gone two miles (three kilomètres) beyond the Roman camp. By this manoeuvre, Ariovistus cut off Cæsar's communication with Sequania and the Æduan country, but he left open the communications with the country of the Leuci and the Lingones.[223] (_See the Map of Gaul, 2._) The two armies thus encamped at a short distance from each other. During the five following days, Cæsar drew out his troops each day, and formed them in order of battle at the head of his camp (_pro castris suas copias produxit_), but was not able to provoke the Germans to fight; all hostility was limited to cavalry skirmishes, in which the latter were much practised. To 6,000 horsemen was joined an equal number of picked men on foot, among whom each horseman had chosen one to watch over him in combat. According to circumstances, the horsemen fell back upon the footmen, or the latter advanced to their assistance. Such was their agility, that they kept up with the horses, running and holding by the mane.[224]
Cæsar, seeing that Ariovistus persisted in shutting himself up in his camp and intercepting his communications, sought to re-establish them, chose an advantageous position about 600 paces (900 mètres) beyond that occupied by the Germans, and led thither his army drawn up in three lines. He kept the first and second under arms, and employed the third on the retrenchments. The spot on which he established himself is perhaps the eminence situated on the Little Doller, to the north of Schweighausen. Ariovistus sent thither about 16,000 of his light troops and all his cavalry, to intimidate the Romans and impede the works. Nevertheless, the third line continued them, and the two others repelled the attack. The camp once fortified, Cæsar left in it two legions and a part of the auxiliaries, and took back the four others to the principal camp. The two Roman camps were 3,600 mètres distant from each other.