Has anyone other than me had a chance to enjoy the Videssos Cycle series by Harry Turtledove? (Not *positive* on the name of the series...). It is a series of (I think) 6 books that revolves around a Roman scouting legion that is magically transported to another world where magic and light cavalry hold sway, along with intense politics, and infantry is unheard of as a force to be reckoned with. This legion turns up in an ancient empire which is slowly crumbling into ruin as it is besieged by enemies both within and without. They are hired as mercenaries by this empire and the saga gets interesting from there.
For anyone who really relished in depth detailing of large scale ancient battles, you'll love this series. The author seems to use the battle system from AD&D (can't remember the damn name of the kit used for large battles...came out in conjunction with the Bloodstone Pass modules).
Highly recommended!
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Now where did I leave that doughnut?!