The north bank of the Pinarus was in this part steep and defended by stakes in places; the Greek mercenaries were as brave as the Macedonians, and fought valiantly.

It was not till the troops which had routed the Persian right began, to act against their centre, assailing it upon the flank, while it was at the same time engaged in front, that the mercenaries were overpowered and gave way.
Seeing their defeat, the horse likewise fled, and thus the rout became general.
It is not quite clear what part Darius took in the battle, or how far he was answerable for its untoward result.

According to Arrian, he was struck with a sudden panic on beholding the flight of his left wing, and gave orders to his charioteer instantly to quit the field.

But Curtius and Diodorus represent him as engaged in a long struggle against Alexander himself, and as only flying when he was in imminent danger of falling into the enemy's hands.

Justin goes further, and states that he was actually wounded.