The description of this battle, as given in the “Commentaries,” has been differently understood. According to Dio Cassius, the Britons had at first thrown the ranks of the Romans into disorder by means of their chariots; but Cæsar, to baffle this manœuvre, had opened for them a free passage by placing his cohorts at greater intervals. He would thus have repeated the dispositions taken by Scipio at the battle of Zama, to protect him against the Carthaginian elephants. This engagement, which took place before the camp and under the eyes of the army, showed how little the Roman tactics were fitted for this kind of warfare. The legionary, heavily armed, and accustomed to combat in line, could neither pursue the enemy in his retreat, nor move too far from his ensigns. There existed a still greater disadvantage for the cavalry. The Britons, by a simulated flight, drew them away from the legionaries, and then, jumping down from their chariots, engaged on foot in an unequal struggle; for, always supported by their cavalry, they were as dangerous in the attack as in the defence.[403] The following day, the enemies took a position far from the camp, on the heights; they only showed themselves in small parties, isolated, harassing the cavalry with less ardour than before. But, towards the middle of the day, Cæsar having sent three legions and the cavalry, under the orders of the lieutenant C. Trebonius, to forage, they rushed from all sides upon the foragers with such impetuosity, that they approached the eagles and legions which had remained under arms. The infantry repulsed them vigorously, and, though they usually left to the cavalry the care of the pursuit, this time they did not cease to drive them before them till the cavalry, feeling themselves supported, came themselves to complete the rout. These left them time neither to rally nor to halt, nor to descend from their chariots, but made a great carnage of them. After this defeat, the Britons resolved to combat no more with their forces united, but to confine themselves to harassing the Roman army, so as to drag on the war in length.[404] [Sidenote: March towards the Thames.]