American Civil War Riverine Actions is a set of free wargames rules for ironclads, tin-clads, cotton-clads and all the fun and unique ships that plied the rivers of the United States during the ACW.
American Civil War
Large Scale Civil War Battle Rules
Large Scale Civil War Battles is a set of free wargames rules where one base=1000 men and an inch=100 yards.
The Battle of Blackburn’s Ford
The Battle of Blackburn’s Ford is an introduction to the Combat Command American Civil War Rules. The pdf also includes counters if you don’t have figures.
15mm Paper American Civil War Wood and Stone Barns
At the Game Architect blog, you’ll find a good looking paper model of a 15mm American Civil War wood and stone barns. The models are in black and white, so you’ll have to apply your own coloring.
Tin Army In The Civil War
Tin Army In The Civil War is a set of free wargames rules for the American Civil War by Ross Mcfarlane. The author writes:
This is a simple set of wargame rules aimed at Division or Corps sized battles. They assume that low level tactics are being handled by regimental officers and their Brigadiers and by the dice. The game may be played on grid with 1 unit per grid area otherwise all distances are roughly equal to the frontage of a deployed infantry unit or roughly 150 yards. Units within that distance and directly in front of, behind or beside each other are deemed to be adjacent. Turns represent a variable length of time and overlap the previous and following enemy turns. 12 to 15 turns each is a good medium length game with a simple scenario and a dozen or so units per side.