Plutarch, Pompey
Bernadotte Perrin, Ed.

7. There came up against him, accordingly, three hostile generals at once, Carinas, Cloelius, and Brutus,¹ not all in front of him, nor from any one direction, but encompassing him round with three armies, in order to annihilate him. Pompey, however, was not alarmed, but collected all his forces into one body and hastened to attack one of the hostile armies, that of Brutus, putting his cavalry, among whom he himself rode, in the van. [2] And when from the enemy's side also the Celtic horsemen rode out against him, he promptly closed with the foremost and sturdiest of them, smote him with his spear, and brought him down. Then the rest turned and fled and threw their infantry also into confusion so that there was a general rout. After this the opposing generals fell out with one another and retired, as each best could, and the cities came over to Pompey's side, arguing that fear had scattered his enemies. [3] Next, Scipio the consul came up against him, but before the lines of battle were within reach of each other's javelins, Scipio's soldiers saluted Pompey's and came over to their side, and Scipio took to flight.² Finally, when Carbo himself sent many troops of cavalry against him by the river Arsis, he met their onset vigorously, routed them, and in his pursuit forced them all upon difficult ground impracticable for horse; there, seeing no hope of escape, they surrendered themselves to him, with their armour and horses.