Ariovistus sent emissaries to Caesar requesting a meeting. They met under a truce at a knoll on the plain. The truce was violated when Caesar learned German horsemen were edging towards the knoll and throwing stones at his mounted escort. Two days later, Ariovistus requested another meeting. Hesitant to send senior officials, Caesar dispatched Valerius Procillus, his trusted friend, and Caius Mettius, a merchant who had traded successfully with Ariovistus. Insulted, Ariovistus threw the envoys in chains. Ariovistus marched for two days and made camp miles behind Caesar, thus cutting off his communication and supply lines with the allied tribes. Unable to entice Ariovistus into battle, Caesar ordered a second smaller camp built near Ariovistus' position. After the camp was completed, Caesar again challenged Ariovistus and was rewarded when he attacked the smaller camp and was repulsed.