I think I saw most of them when I watched "The Good, The Bad and The Ugly" the other day.
From them to you:
We have an a decent size range of American Civil War Fortress and Naval artillery for 28mm games now available. Ideal as objectives or to add some heavy firepower to defences.
Currently eight models are available with a couple more in the pipeline. Models include a 32 pounder upto the huge 15 inch Rodman gun