de bello gallico, 5.47

Having been made sure of the arrival of Crassus by the scouts at about the third hour, on this day he advances twenty miles. He put Crassus in charge of Samarobriva and assigns a legion, because he was leaving there the baggage of the army, the hostages of the states, the public documents, and all the corn which he had conveyed thither for the sake of enduring the winter. Fabius, as he had been commanded, having delayed not so much, meets him on the march with his legion. Labienus—with the death of Sabinus and the slaughter of the cohorts having been recognized, when all the forces of the Treveri had come against him, having feared lest, if he had made a departure from his winter-quarters, similar to a flight, he would not be able to sustain the attack of the enemy, especially whom he knew to be elated by their recent victory—sends back a letter to Caesar: with how much danger he would have lead out his legion from winter quarters; he reports situation having occurred among the Eburones; he informs (him) that all the cavalry and infantry troops of the Treveri had encamped three miles distant from his own camp.