C. Julius Caesar, Gallic War

Scarcely had the rear advanced beyond the fortifications when the Gauls, encouraging one another "not to cast from their hands the anticipated booty, that it was a tedious thing, while the Romans were panic-stricken, to be waiting for the aid of the Germans, and that their dignity did not suffer them to fear to attack with such great forces so small a band, particularly when retreating and encumbered," do not hesitate to cross the river and give battle in a disadvantageous position. Labienus suspecting that these things would happen, was proceeding quietly, and using the same pretense of a march, in order that he might entice them across the river. Then, having sent forward the baggage some short distance and placed it on a certain eminence, he says, "Soldiers, you have the opportunity you have sought: you hold the enemy in an encumbered and disadvantageous position: display to us, your leaders, the same valor you have ofttimes displayed to your general: imagine that he is present and actually sees these exploits." At the same time he orders the troops to face about toward the enemy and form in line of battle, and, dispatching a few troops of cavalry as a guard for the baggage, he places the rest of the horse on the wings. Our men, raising a shout, quickly throw their javelins at the enemy. They, when, contrary to their expectation, they saw those whom they believed to be retreating, advance toward them with threatening banners, were not able to sustain even the charge, and, being put to flight at the first onslaught, sought the nearest woods; Labienus pursuing them with the cavalry, upon a large number being slain, and several taken prisoners, got possession of the state a few days after; for the Germans, who were coming to the aid of the Treviri , having been informed of their flight, retreated to their homes. The relations of Indutiomarus, who had been the promoters of the revolt, accompanying them, quitted their own state with them. The supreme power and government were delivered to Cingetorix, whom we have stated to have remained firm in his allegiance from the commencement.