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BATTLE OF ARBELA.

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 horseguards, 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, and Aretes's and Ariston's light horse. Menidas was ordered to watch if the enemy's cavalry tried to turn their flank, and, if they did so, to charge them before they wheeled completely round, and so take them in flank themselves. A similar force was arranged on the left of the second line for the same purpose. The Thracian infantry of Sitalces were placed there, and Cœranus's regiment of the cavalry of the Greek allies, and Agathon's troops of the Odrysian irregular horse. The extreme left of the second line in this quarter was held by Andromachus's cavalry. A division of Thracian infantry was left in guard of the camp. In advance of the right wing and centre was scattered a number of light-armed troops, of