C. Julius Caesar, Gallic War

During the remaining days after this, Caesar began to cut down the forests; and that no attack might be made on the flank of the soldiers, while unarmed and not foreseeing it, he placed together (opposite to the enemy) all that timber which was cut down, and piled it up as a rampart on either flank. When a great space had been, with incredible speed, cleared in a few days, when the cattle [of the enemy] and the rear of their baggage train were already seized by our men, and they themselves were seeking for the thickest parts of the forests, storms of such a kind came on that the work was necessarily suspended, and, through the continuance of the rains, the soldiers could not any longer remain in their tents. Therefore, having laid waste all their country, [and] having burned their villages and houses, Caesar led back his army and stationed them in winter quarters among the Aulerci and Lexovii, and the other states which had made war upon him last.