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BATTLE OF ARBELA.

Alexander's operations with his right and centre had exposed his left to an immensely preponderating force of the enemy. Parmenio kept out of action as long as possible; but Maz├Žus, who commanded the Persian right wing, advanced against him, completely out-flanked him, and pressed him severely with reiterated charges by superior numbers. Seeing the distress of Parmenio's wing, Simmias, who commanded the sixth brigade of the phalanx, which was next to the left wing, did not advance with the other brigades in the great charge upon the Persian centre, but kept back to cover Parmenio's troops on their right flank; as otherwise they would have been completely surrounded and cut off from the rest of the Macedonian army. By so doing, Simmias had unavoidably opened a gap in the Macedonian left centre; and a large column of Indian and Persian horse, from the Persian right centre, had galloped forward through this interval, 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