C. Julius Caesar, Gallic War

The Helvetii, compelled by the want of every thing, sent embassadors to him about a surrender. When these had met him on the way and had thrown themselves at his feet, and speaking in suppliant tone had with tears sued for peace, and [when] he had ordered them to await his arrival, in the place, where they then were, they obeyed his commands. When Caesar arrived at that place, he demanded hostages, their arms, and the slaves who had deserted to them. While those things are being sought for and got together, after a night's interval, about 6000 men of that canton which is called the Verbigene, whether terrified by fear, lest after delivering up their arms, they should suffer punishment, or else induced by the hope of safety, because they supposed that, amid so vast a multitude of those who had surrendered themselves, their flight might either be concealed or entirely overlooked, having at night-fall departed out of the camp of the Helvetii, hastened to the Rhine and the territories of the Germans.