C. Julius Caesar, Gallic War

Labienus, since he was confining himself within a camp strongly fortified by the nature of the ground and by art, had no apprehensions as to his own and the legion's danger, but was devising that he might throw away no opportunity of conducting the war successfully. Accordingly, the speech of Indutiomarus, which he had delivered in the council, having been made known [to him] by Cingetorix and his allies, he sends messengers to the neighboring states and summons horse from all quarters: he appoints to them a fixed day for assembling. In the mean time, Indutiomarus, with all his cavalry, nearly every day used to parade close to his [Labienus'] camp; at one time, that he might inform himself of the situation of the camp; at another time, for the purpose of conferring with or of intimidating him. Labienus confined his men within the fortifications, and promoted the enemy's belief of his fear by whatever methods he could.