The Guns of Gettysburg is a simulation of the largest battle of the American Civil War. The game is derived from the system used in Bowen Simmons's previous games: Bonaparte at Marengo and Napoleon's Triumph. Units in the game are represented by linear blocks rather than the traditional hex and counters.

The Guns of Gettysburg is designed to have simple rules and fast play, while at the same time reflecting the historical limitations of the actual conflict. The game's rules are refined somewhat from its predecessors but overall reflect the same fast play as its predecessors.

Players are able to play single day scenarios or the full three day battle.

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– The Guns of Gettysburg fan