=84.= BATTLE OF ARBELA. On the morning of the 1st of October, B. C. 331, the two great forces met upon the plain of Gaugame´la. Alexander fought at the head of his cavalry, on the right of his army. Darius, in the Persian center, animated his men both by word and example. Both sides fought with wonderful bravery, but the perfect discipline of the Macedonians gained at length a complete victory. The Persian war-chariots, which, with long scythes extending from their wheels, were intended to make great havoc among the Greek horse, were rendered useless by a detachment of light-armed troops trained for the purpose, who, first wounding horses and drivers with their javelins, ran beside the horses and cut the traces or seized the reins, while the few which reached the Macedonian front were allowed to pass between files which opened to receive them, and were easily captured in the rear. Five brigades of the phalanx bore down the Greek mercenaries who were opposed to them, and penetrated to the Persian center, where Darius commanded in person. The king’s charioteer was killed by a javelin; he himself mounted a fleet horse and galloped from the field. Elsewhere the issue of the day was much more doubtful for Alexander; but the news of Darius’s flight disheartened his officers, and spurred the Macedonians, who were outnumbered and almost overpowered, to fresh exertions. A party of Persian and Indian horsemen, who were plundering the Macedonian camp, were put to flight by a reserve corps of the phalanx. The fugitive king, followed at length by his whole army, directed his course to the city of Arbe´la, twenty miles distant, where his military treasures were deposited. The river Ly´cus lay in their way, crossed only by a narrow bridge, and the number of Persians drowned in this rapid stream exceeded even those who had perished upon the battle-field. =85.= The next day Alexander arrived at Arbela and took possession of its treasures. The Persian king, unhappily for himself, had escaped a generous conqueror only to fall into the hands of his treacherous satrap Bes´sus. This man had led a division of the Persian army in the battle of Arbela, but finding his master’s fortunes ruined, had plotted with some fellow-officers to seize his person, and either put him to death or deliver him to Alexander, hoping thus to gain for themselves important commands. Loaded with chains, the unhappy king was carried away by his servants in their flight toward Hyrca´nia; but Alexander’s troops pressed them closely, and finding escape impossible, they mortally wounded their captive and left him by the road-side to die.