Actually Alexander didn't deploy a great deal of archers in his army. The majority of his army was made of Pezhetairoi, heavy Macedonian phalanx infantry who were very effective against both cavalry and infantry. They were aided by Companion and other forms of powerful shock cavalry, and the main missile corps were the Peltasts, which normally made more than 20% of Alexander's army. Peltast in RTW are rather weak but Alexander seems to be able to put them to good uses, they were later replaced by the more powerful Thureophoroi, which resembles the characteristics of Heavy peltasts in RTW.
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