de bello gallico, 5.38

Elated by this victory, Ambiorix immediately advances with his cavalry among the Aduatuci, who were neighbors to his kingdom; he stops neither through the day nor through the night, and orders the infantry to follow him closely. With the matter having been explained and the Aduatuci roused, the next day he arrived among the Nervii and he urged that they not throw away the opportunity of liberating themselves in perpetuity and of punishing the Romans for those wrongs which they have received; he points out that two lieutenants have been killed and that a large part of the army has perished; it is nothing of a trouble that the legion which was wintering with Cicero, having been suddenly attacked, be destroyed; he declares that he is a supporter for this matter. He easily persuades the Nervii by this speech.