When his scouts reported that Dareius was only thirty stades away1 and advancing in alarming fashion with his forces drawn up for battle, a frightening spectacle, Alexander grasped that this was a god-given opportunity to destroy the Persian power in a single victory. He roused his soldiers with appropriate words for a decisive effort and marshalled the battalions of foot and the squadrons of horse appropriately to the location. He set the cavalry along the front of the whole army, and ordered the infantry phalanx to remain in reserve behind it.