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Rh Parmenio on the left. When Darius had marshalled his phalanx, by a pre-concerted signal he recalled the cavalry which he had posted in front of the river for the express purpose of rendering the arranging of his army easy. Most of these he placed on the right wing near the sea facing Parmenio; because here the ground was more suitable for the evolutions of cavalry. A certain part of them also he led up to the mountain towards the left. But when they were seen to be useless there on account of the narrowness of the ground, he ordered most of these also to ride round to the right wing and join their comrades there. Darius himself occupied the centre of the whole army, inasmuch as it was the custom for the kings of Persia to take up that position, the reason of which arrangement has been recorded by Xenphon, son of Gryllus.  

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. 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