to be on their march, with Pompey at their head, through Mauritania, having died away, several of the more distant states revolt from Afranius, and enter into league with Caesar.
LXI.--Whilst the spirits of the enemy were dismayed at these things, Caesar, that he might not be always obliged to send his horse a long circuit round by the bridge, having found a convenient place, began to sink several drains, thirty feet deep, by which he might draw off a part of the river Segre, and make a ford over it. When these were almost finished, Afranius and Petreius began to be greatly alarmed, lest they should be altogether cut off from corn and forage, because Caesar was very strong in cavalry. They therefore resolved to quit their posts, and to transfer the war to Celtiberia. There was, moreover, a circumstance that confirmed them in this resolution: for of the two adverse parties, that which had stood by Sertorius in the late war, being conquered by Pompey, still trembled at his name and sway, though absent: the other which had remained firm in Pompey's interest, loved him for the favours which they had received: but Caesar's name was not known to the barbarians. From these they expected considerable aid, both of horse and foot, and hoped to protract the war till winter, in a friendly country. Having come to this resolution, they gave orders to collect all the ships in the river Ebro, and to bring them to Octogesa, a town situated on the river Ebro, about twenty miles distant from their camp. At this part of the river, they ordered a bridge to be made of boats fastened together, and transported two legions over the river Segre, and fortified their camp with a rampart, twelve feet high.
LXII.--Notice of this being given by the scouts, Caesar continued his work day and night, with very great fatigue to the soldiers, to drain the river, and so far effected his purpose, that the horse were both able and bold enough, though with some difficulty and danger, to pass the river; but the foot had only their shoulders and upper part of their breast above the water, so that their fording it was retarded, not only by the depth of the water, but also by the rapidity of the current. However, almost at the same instant, news was received of the bridge being nearly completed over the Ebro, and a ford was found in the Segre.
LXIII.--Now indeed the enemy began to think that they ought to hasten their march. Accordingly, leaving two auxiliary cohorts in the garrison at Ilerda, they crossed the Segre with their whole force, and formed one camp with the two legions which they had led across a few days before. Caesar had no resource, but to annoy and cut down their rear; since with his cavalry to go by the bridge, required him to take a long circuit; so that they would arrive at the Ebro by a much shorter route. The horse, which he had detached, crossed the ford, and when Afranius and Petreius had broken up their camp about the third watch, they suddenly appeared on their rear, and spreading round them in great numbers, began to retard and impede their march.