Clash of Giants: Civil War, takes the game system from Ted S. Raicer's popular and critically acclaimed Clash of Giants WWI series to two of the storied battles of the American Civil War: Second Bull Run and Gettysburg. CoG: Civil War uses a modified version of the chit-pull Activation system of Clash of Giants II: Campaigns of Galicia and First Ypres, 1914, while retaining the CoG combat system. Every (mostly brigade-level) unit has a Tactical Efficiency Rating based on its morale, training, leadership, and experience, but even a poor unit can have a heroic moment, while the Iron Brigade might not always be made of iron. It is a true player's system, which produces realistic results without a lot of fiddly procedures, and allows players to concentrate on the game rather than the rules.

Not simply "another Civil War battle system," CoG: Civil War presents a fresh new look at an oft-game topic. Giving each side a chance to change history in an afternoon's gaming, the use of the Clash of Giants system also shows the sometimes surprising links between the battles of the Civil War and the opening battles of the Great War 50 years later. Fans of either the Civil War or the Clash of Giants series will not be disappointed.