In this manner, it is said that the battle on the river was brought about rather from accident than any design on the part of the commander. XX. After destroying many of the Ambrones, the Romans retreated and night came on; yet this great success was not followed, as is usual on such occasions, by pæans of victory, and drinking in the tents, and merriment over supper, and what is sweetest of all to men who have won a victory, gentle sleep, but the Romans spent that night of all others in fear and alarm. For their camp had neither palisade nor rampart, and there were still left many thousands of the enemy, and all night long they heard the lamentation of the Ambrones who had escaped and joined the rest of the barbarians, and it was not like the weeping and groaning of men, but a howl resembling that of wild beasts; and a bellowing mingled with threats and cries of sorrow proceeding from such mighty numbers, re-echoed from the surrounding mountains and the banks of the river. A frightful noise filled the whole plain, and the Romans were alarmed, and even Marius himself was disturbed, expecting a disorderly and confused battle in the night. However, the enemy made no attack either on that night or the following day, but they were occupied in arranging their forces and making preparations. In the meantime, as the position of the enemy was backed by sloping hills and deep ravines shaded with trees, Marius sent there Claudius Marcellus, with three thousand heavy-armed soldiers, with instructions to lie concealed in ambush, and to appear on the rear of the barbarians when the battle was begun. The rest of the army, who supped in good time and got a night's rest, he drew up at daybreak in front of the camp, and ordered the cavalry to advance into the plain. The Teutones, observing this, would not wait for the Romans to come down and fight with them on fair ground, but with all speed and in passion they took to their arms and advanced up the hill. Marius sent his officers to every part of the army, with orders to the soldiers to stand firm in their ranks till the enemy came within the reach of their spears, which they were to discharge, and then to draw their swords, and drive against the barbarians with their shields; for as the ground was unfavourable to the enemy, their blows would have no force, and their line no strength, owing to the unevenness of the surface, which would render their footing unstable and wavering. The advice which he gave to his soldiers he showed that he was the first to put in practice; for in all martial training Marius was inferior to none, and in courage he left all far behind him.