Imperial Rome vs The Barbarians will feature over 20 scenarios that range from 390 BC (Allia River) to 9 AD (Teutoburger Wald), and all the blocks and labels you need to field the Roman and Barbarian forces to fight out these battles, and at least one new unit type as well as several "specialty" units and leaders (Briton Chariots, Legionaries using the pilum, and Caesar, for example). Each of these operates within the confines of the original system rules, with only slight modifications to reflect their historical abilities and importance. So, rules-wise, if you've played Commands & Colors: Ancients, you'll have no trouble at all learning the few special rules for these new types of units. The Roman Civil Wars will feature familiar units with new capabilities. The Roman legions have evolved into the deadly fighting units of legend. In terms of Commands and Colors performance, the medium infantry units (representing less experienced legions) and heavy infantry units (representing the veteran legions) will now be able to move two hexes without engaging in close combat, or still move one hex and have close combat (as well as throwing their pilum - a capability acquired in Rome vs the Barbarians). You will be able to fight battles with medium and heavy infantry as you have never fought them before! The battle dice resolve combat quickly and the Command cards provide an element of luck that creates a fog of war and presents players with both challenges and opportunities for victory. Yet the tactics you need to execute conform remarkably well to the advantages and limitations inherent to the various Ancient units, their weapons, terrain and the history.