Greg Pitts is an Ancient Military historian and gamer and involved with War Games Journal.
The January issue of the Journal is now out, http://www.wargamesjournal.com/home/index.asp, and the fancied up version of Part 4 of the Roman Imperial Army is included in the issue.
Greg also runs a gaming group on Yahoo!, Ancient Empires, 2nd Edition and says: 'I have attempted now for many years to obtain a game mechanic system that gives what I consider to be the correct "feel" for warfare in antiquity, while still remaining a playable game.'
He is working on a writing project on Scipio Africanus and the Roman Military System.
Postscript: See Greg's comment on the Battle of Magnesia.