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90, and right through the troops of the Macedonian second line. Instead of then wheeling round upon Parmenio, or upon the rear of Alexander's conquering wing, the Indian and Persian cavalry rode straight on to the Macedonian camp, overpowered the Thracians who were left in charge of it, and began to plunder. This was stopped by the phalangite troops of the second line, who, after the enemy's horsemen had rushed by them, faced about, countermarched upon the camp, killed many of the Indians and Persians in the act of plundering, and forced the rest to ride off again. Just at this crisis, Alexander had been recalled from his pursuit of Darius by tidings of the distress of Parmenio, and of his inability to bear up any longer against the hot attacks of Mazus. Taking his horse-guards with him, Alexander rode toward the part of the field where his left wing was fighting; but on his way thither he encountered the Persian and Indian cavalry, on their return from his camp.

These men now saw that their only chance of safety was to cut their way through, and in one huge column they charged desperately upon the Macedonian regiments. There was here a close hand-to-hand fight, which lasted some time, and sixty of the royal horse-guards fell, and three generals, who fought close to Alexander's side, were wounded. At length the Macedonian discipline and valor again prevailed, and a large number of the Persian and Indian horsemen were cut down, some few only succeeding in breaking through and riding away. Relieved of these obstinate enemies, Alexander again formed his regiments of horse-guards, and led them toward Parmenio; but by this time that general also was victorious. Probably the news of Darius's flight had reached Mazus, and had damped the ardor of the Persian right wing, while the tidings of their comrades' success must have proportionally encouraged the Macedonian forces under Parmenio. His Thessalian cavalry particularly distinguished themselves by their gallantry and persevering good conduct; and by the time that Alexander had ridden up to Parmenio, the whole Persian army was in full flight from the field.

It was of the deepest importance to Alexander to secure the person of Darius, and he now urged on the pursuit. The River Lycus was between the field of battle and the city of Arbela, whither the fugitives directed their course, and the passage of this river was even more destructive to the Persians than the