C. Julius Caesar, Gallic War

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.