From Wikipedia:
http://en.wikipedia.org/wiki/Warmaster#Warmaster_AncientsWarmaster Ancients GameplayThe gameplay for Warmaster Ancients follows the same basic procedure as Warmaster Fantasy, but differs in the following way :
Magic, dragons and other such are naturally not present in this rule set (although historical large creatures, such as elephants, are present in some armies).
Units may only receive three consecutive orders.
Combat is limited to two exchanges, unlike the fantasy version, where units may continue to attack as long as they have valid targets in range. This allows players to reinforce their troops under attack and prevents a lucky player from "rolling up" a flank.
There are special rules for many historical unit types. Units based on the 20 mm edge are designated as "shock troops" and include heavy cavalry, elephants and phalanges using pikes. Among the most important new troop types are skirmishers, mobile light troops that can evade an enemy charge and can be used to delay an enemy advance.
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Here's a player review:
http://theminiaturespage.com/boards/msg.mv?id=51491