Most Irregular is horse and musket rules extension to the Fast and Dirty skirmish rules, found on the same page.
Rules: American Civil War
Under The Shade Of The Trees ACW Rules
Under The Shade Of The Trees is a set of free wargames rules for the American Civil War. They’re designed as “fast play” and suggest using standard Johnny Reb or Fire and Fury basing.
The Revised Brom ACW Rules
The Revised Brom is a set of free wargames rules by Jay Ainsworth for wargames set in the American Civil War. They’re based on an original set of Larry Brom rule (duh). It uses a typical Brom card activation system, a random movement distance mechanism, and simultaneous fire.
See The Elephant American Civil War Rules
See The Elephant is a set of free wargames rules for the American Civil War played on a chess-like grid.
Mighty Mean Fowt Fights ACW Rules
Mighty Mean Fowt Fights is a set of free wargames rules for American Civil War battle games played on a square grid.