Alexander began the action by dislodging a detachment of the enemy which had been posted at the base of the mountains and threatened his rear. Finding the Persians did not advance, he crossed the river and charged their left wing with such impetuosity that he broke their ranks and swept them from the field irretrievably discomfited. He then wheeled round and brought timely succour to his phalanx, which the Greek mercenaries of Darius were driving back with disordered ranks to the river. The struggle now became desperate, for these mercenaries, bitterly resenting the state of political degradation to which the Macedonians had reduced their compatriots in southern Greece, now fought against them with all the fury that the passions of hate and rivalry could inspire. They were nevertheless driven back, and the tide of battle surged up towards the state chariot itself, on which Darius was mounted in the centre of his line. The pusillanimous monarch no sooner perceived that his person was in danger than he ordered his charioteer to turn the heads of his horses for flight. This decided the fortunes of the day; it was the signal of his defeat, and his troops, on seeing it, at once broke from their ranks and fled from the field. The cavalry even, which on the extreme right had victory almost within their grasp, yielded to the general panic, and helped to swell the crowd of fugitives. As the narrowness of the plain allowed but very little room for escape, the vanquished were massacred in myriads. Darius escaped across the Euphrates, but his treasures and his family, consisting of his mother, wife, and children, fell into Alexander’s hands, who treated these illustrious captives with all the kindness and courtesy which were due alike to their misfortunes and their exalted rank.