Meantime when Alexander perceived that nearly all the Persian cavalry had changed their ground and gone to his left towards the sea, and that on his side only the Peloponnesians and the rest of the Grecian cavalry were posted there, he sent the Thessalian cavalry thither with speed, ordering them not to ride along before the front of the whole array, lest they should be seen by the enemy to be shifting their ground, but to proceed by stealth in the rear of the phalanx.[249] In front of the cavalry on the right, he posted the lancers under the command of Protomachus, and the Paeonians under that of Aristo; and of the infantry, the archers under the direction of Antiochus, and the Agrianians under that of Attalus. Some of the cavalry and archers also he drew up so as to form an angle with the centre[250] towards the mountain which was in the rear; so on the right his phalanx had been drawn up separated into two wings, the one fronting Darius and the main body of Persians beyond the river, and the other facing those who had been posted at the mountain in their rear. On the left wing the infantry consisting of the Cretan archers and the Thracians under command of Sitalces were posted in front; and before these the cavalry towards the left. The Grecian mercenaries were drawn up as a reserve for all of them. When he perceived that the phalanx towards the right was too thin, and it seemed likely that the Persians would outflank him here considerably, he ordered two squadrons of the Companion cavalry, viz. the Anthemusian,[251] of which Peroedas, son of Menestheus, was captain, and that which was called Leugaean, under the command of Pantordanus, son of Cleander, to proceed from the centre to the right without being seen. Having also marched the archers, part of the Agrianians and of the Grecian mercenaries up along his right in the front, he extended his phalanx beyond the wing of the Persians. But when those who had been posted upon the mountain did not descend, a charge was made by a few of the Agrianians and archers at Alexander’s order, by which they were easily put to the rout from the foot of the mountain. As they fled to the summit he decided that he could make use of the men who had been drawn up to keep these in check, to fill up the ranks of his phalanx. He thought it quite sufficient to post 300 horsemen to watch the men on the mountain. CHAPTER X. BATTLE OF ISSUS.