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Rh Macedonians advanced in two lines against the enemy, Alexander himself leading on the right wing, and the renowned phalanx forming the centre, while Parmenio commanded on the left.

Such was the general nature of the disposition which Alexander made of his army. But we have in Arrian the details of the position of each brigade and regiment; and as we know that these details were taken from the journals of Macedonian generals, it is interesting to examine them, and to read the names and stations of King Alexander's generals and colonels in this, the greatest of his battles.

The eight regiments of the royal horse-guards formed the right of Alexander's line. Their colonels were Cleitus (whose regiment was on the extreme right, the post of peculiar danger), Glaucias, Ariston, Sopolis, Heracleides, Demetrias, Meleager, and Hegelochus. Philotas was general of the whole division. Then came the Shield-bearing infantry: Nicanor was their general. Then came the phalanx in six brigades. Cnus's brigade was on the right, and nearest to the Shield-bearers; next to this stood the brigade of Perdiccas, then Meleager's, then Polysperchon's; and then the brigade of Amynias, but which was now commanded by Simmias, as Amynias had been sent to Macedonia to levy recruits. Then came the infantry of the left wing, under the command of Craterus. Next to Craterus's infantry were placed the cavalry regiments of the allies, with Eriguius for their general. The Thessalian cavalry, commanded by Philippus, were next, and held the extreme left of the whole army. The whole left wing was intrusted to the command of Parmenio, who had round his person the Pharsalian regiment of cavalry, which was the strongest and best of all the Thessalian horse regiments.

The centre of the second line was occupied by a body of phalangite infantry, formed of companies which were drafted for this purpose from each of the brigades of their phalanx. The officers in command of this corps were ordered to be ready to face about, if the enemy should succeed in gaining the rear of the army. On the right of this reserve of infantry, in the second line, and behind the royal horse-guards, Alexander placed half the Agrian light-armed infantry under Attalus, and with them Brison's body of Macedonian archers and Cleander's regiment of foot. He also placed in this part of his army Menidas's squadron of cavalry,