Crassus

After this, he marched along the river with seven legions of men-at-arms, nearly four thousand horsemen, and about as many light-armed troops. Some of his scouts now came back from their explorations, and reported that the country was destitute of men, but that they had come upon the tracks of many horses which had apparently wheeled about and fled from pursuit. Wherefore Crassus himself was all the more confident, and his soldiers went so far as to despise the Parthians utterly, believing that they would not come to close quarters.

But, nevertheless, Cassius once more had a conference with Crassus, and advised him above all things to recuperate his forces in one of the garrisoned cities, until he should get some sure information about the enemy; but if not this, then to advance against Seleucia along the river. For in this way the transports would keep them abundantly supplied with provisions by putting in at their successive encampments, and, by having the river to prevent their being surrounded, they would always fight their enemies on even terms and face to face.