Mike Callan offers this set of free wargames rules for American Civil War Ironclads. The set originally was published in Wargames Illustrated 14.
Rules: American Civil War
Iron Brigade Civil War Rules
Iron Brigade is Mike Willegal’s third edition of his Civil War rules. It’s designed on a 1/20 scale.
American Civil War Riverine Actions
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.
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.