Rudi Geudens has written a modification of Richard Borg’s Battlecry game for miniatures. You need a set of the original rules to play, though.
ACW
North Against South BattleCry Variant
North Against South is a set of free wargames rules for civil war battles. It’s based on the boardgame Battle Cry by Richard Borg.
Naval Warfare In The Civil War
Peter Hunt of the Hong Kong Society of Wargamers has written a set of articles about Naval Warfare in the American Civil War. This is, I think, a sadly neglected period for wargamers. I have a couple of dozen ships in 1/1200 scale, and the games have always been well received.
Civil War Artillery Primer
Mike’s Hobby Home has this primer on American Civil War artillery. The information includes a good table on the various pieces, including data on the shot size, range of the weapons, elevation and the number in use.
Warmaster ACW
John Martin has written a set of free wargames rules for the American Civil War based on Games Workshop’s Warmaster. I think that things have come full circle here, because Warmaster obviously took much of its inspiration from the seminal ACW rules set, “Fire and Fury.” Not that GW would ever admit that. After all, according to the Evil Empire, miniature wargaming is the “Games Workshop Hobby”, which precludes the acknowledgement of any other rules set or miniatures.