C. Julius Caesar, Gallic War

In the same condition were the Usipetes and the Tenchtheri (whom we have mentioned above), who, for many years, resisted the power of the Suevi, but being at last driven from their possessions, and having wandered through many parts of Germany , came to the Rhine , to districts which the Menapii inhabited, and where they had lands, houses, and villages on either side of the river. The latter people, alarmed by the arrival of so great a multitude, removed from those houses which they had on the other side of the river, and having placed guards on this side the Rhine , proceeded to hinder the Germans from crossing. They, finding themselves, after they had tried all means, unable either to force a passage on account of their deficiency in shipping, or cross by stealth on account of the guards of the Menapii, pretended to return to their own settlements and districts; and, after having proceeded three days' march, returned; and their cavalry having performed the whole of this journey in one night, cut off the Menapii, who were ignorant of, and did not expect [their approach, and] who, having moreover been informed of the departure of the Germans by their scouts, had, without apprehension, returned to their villages beyond the Rhine . Having slain these, and seized their ships, they crossed the river before that part of the Menapii, who were at peace in their settlements over the Rhine , were apprized of [their intention]; and seizing all their houses, maintained themselves upon their provisions during the rest of the winter.