Antony

He comprehended that this was the work of the Parthians, throwing the river in their way to obstruct and delay the Roman march, and urged Antony to look out and be on his guard, as the enemy were near. And just as Antony was setting his legionaries in array and arranging to have his javelineers and slingers make a sally through them against the enemy, the Parthians came into view and began to ride around the army in order to envelope and throw it into confusion on all sides.

Whenever the Roman light-armed troops sallied out against them, the Parthians would inflict many wounds with their arrows, but sustain yet more from the leaden bullets and javelins of the Romans, and therefore withdraw. Then they would come up again, until the Celts, massing their horses together, made a charge upon them and scattered them, so that they showed themselves no more that day.

Having thus learned what he ought to do, Antony covered not only his rear, but also both his flanks, with numerous javelineers and slingers, led his army in the form of a hollow square, and gave orders to his horsemen to rout the enemy when they attacked, but after routing them not to pursue them further. Consequently the Parthians, during four successive days, suffered greater loss than they inflicted, became less eager, and made the winter an excuse for thoughts of going away.