I own the rules but have not played them yet. Figures are individually based and organized into units with 50 to 60 figures per player. Troops are defined by several characteristics (training, morale, etc) and weapons have classes (thrusting, armor-defeating, etc). Heroes and leaders (knights) lead troops who may otherwise just stand and watch the fight rather than get their hands dirty. There are 2 types of turn sequence -- you move a unit, I move a unit or by random dice roll according to the training of the unit. All in all they are more involved mechanic-wise than his other games (I have his Africa, Ancients and American West rules) and provide no army lists (none are needed, really.) Games concentrate on infantry and cavalry with little or no use for artillery. The rules seem adaptable for most pre-gunpowder periods and nations (like Asia as well as the Middle East and Europe).
Hope this helps.