Full prelude:
Caesar was not far away, probably at or near Bibracte, where he had just won a major victory over the Helvetii and other Celtic tribes, and had disposed of the remaining Boii, allowing them to settle in Aeduan land. As only small numbers of Boii were left after the battle, the Aedui were obliging. Caesar must have immediately begun marching up the Saône valley.

Ariovistus, being a skilled general in his own right, identified Vesontio as the key to the strategic Doubs valley and marched for it, but Caesar, probably relying on intelligence from the Gauls, arrived there first and established a main base. He had to combat a panic among his own men, who had heard that the Germans were some sort of superior warriors. Caesar called a meeting and then berated the centurions for making that necessary instead of just following orders. In one of his noted speeches he recalled them to duty and ended by threatening to march the next morning early with only the 10th legion, about whose valour he said he had no doubts at all. The speech had the intended effect of arousing fanatical loyalty in the 10th and shame and rivalry in the others.

Vesontio is about 75 miles (121 km) from the Rhine. Apparently Ariovistus had learned of the Roman presence there because he stopped marching and waited. Using Diviciacus as a guide, Caesar's troops marched 50 miles (80 km) in 7 days, arriving probably in the vicinity of Belfort. The army was moving only 7 miles per day and was relying on Diviciacus to lead them through open country; thus, it is probably safe to assume there were no Roman roads between Besançon and Belfort at that time. Caesar says that he took a detour to stay in open country, most likely west of the Doubs, through the lands of his Celtic allies.

Ariovistus sent ambassadors to Caesar agreeing, because Caesar had come to him, to a conference. Caesar, known for giving his potential enemies every last chance, entertained the idea that Ariovistus was coming to his senses. It was agreed that they should meet on horseback, accompanied only by cavalry. Caesar brought mounted soldiers of the 10th legion, who joked that they had been promoted to knights, which was the origin of the 10th legion's nickname Equestris.

The meeting of the two on a high mound between the camps with the bodyguards a few hundred yards away is surely a rare event in the history of parleys. They both got a chance to present and defend their points of view, face to face, with no filtering or interference from others. Caesar concentrated on Roman policy. Ariovistus now took the tack of claiming the Aedui had attacked him rather than vice versa.

Caesar reports that Ariovistus stated that "he was not so uncivilized nor so ignorant of affairs, as not to know that the Aedui in the very last war with the Allobroges had neither rendered assistance to the Romans, nor received any from the Roman people in the struggles which the Aedui had been maintaining with him and with the Sequani."

Ariovistus described official Roman friendship as a sham, and he uttered another uncanny prophecy: that he could gain the real friendship of many leading men at Rome by killing Caesar. Moreover, the senate, he said, had determined that Gaul should be governed by its own laws and so ought to be free. By then, Caesar had to escape to his bodyguards, as the Germanic cavalry was beginning to hurl missiles.

The next day, Ariovistus invited Caesar to another parlay. Making a point to emphasize that he could not trust the Germans, Caesar sent two junior officers, Gaius Valerius Procillus and Marcus Mettius. They found that Ariovistus in the process of moving his army up and were put in chains.

Over the next few days, Ariovistus moved his camp to within two miles of Caesar's, covering the move with cavalry skirmishes. The Germanic tribes had developed a special force consisting of cavalry mixed with equal numbers of light infantry whose only function was to support cavalrymen, individually or in units, who had become enmeshed in combat. Caesar's men stood in battle formation outside the walls of his camp each day, but only skirmishes were offered. Finally, from a distance of two miles, Ariovistus cut Caesar's supply line, isolating his garrison.

Caesar claims the Germanic side did not attack in force because their wise women had pronounced from their divinations that they should not engage in battle before the new moon. However, it is evident that there was a more mundane reason for Ariovistus declining battle: he had Caesar surrounded. Dio Cassius notes the presence of Germans on the slope of the hill behind the camp, where the Porta Quaestoria, the gate where provisions were brought in, would have been. Ariovistus had Caesar under siege and hoped to starve him out.

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