Rifle Wars

Rifle Wars is a rule system designed to help recreate the large battles of the American Civil War on the tabletop, using miniatures to represent the units. It is not a complete, ready-to-play package with army lists and scenarios; it is a grand-tactical level combat resolution system for those gamers who enjoy researching orders of battle and historical engagements, and then staging recreations or fictional engagements based on historical situations.

Though it plays in approximately real time=game time, it is not the style of game usually termed "fast play". It does not include, nor is it amenable to army lists or point systems, so it will not appeal to the competition gamer. Though the mechanics are simple enough for a beginner to grasp easily, it is not a particularly good introductory set of rules because it produces its best results in the hands of players who already have some understanding of the historical background on which it is based.

—description from the designer