Not War But Murder covers the week-long operation which marked the end of Grant's 30 day, "smash 'em up" campaign begun at Wilderness. Like a bloody chess match, Grant and Lee made move and counter move to get to this point, with Lee well aware that a false move could end the war quickly.

Not War But Murder, by designer Michael Rinella, is his newest area-map game, and his first take on an American Civil War battle. This game includes one 22" by 34" inch area map, 170 5/8" counters, and 12 pages of rules that include designer notes, and optional rules. It also marks the debut of what Rinella calls the "diceless advantage". In previous area-impulse games, from Monty's Gamble all the way to the Avalon Hill games of the early 1990s, an "advantage chit" allowed the person holding it to re-roll an single die roll (or rolls if it was a combat). In NWBM this changes. The player may spend the advantage to gain specific game benefits, automatically. Thus, rather than being hoarded, this "twist of fate" is likely to hop back and forth, as each player strives to save a desperate situation.