The City Class ironclads cost $100,000 each and were flat-bottomed and very importantly, only drew six feet of water; very desirable for river cruising.
Each was 175 feet long and 51.5 feet wide and mounted 13 heavy guns and were seriously under-powered, but effective. Speed wasn't all that important on the rivers.
Of interest, of the 512 tons each weighed, 122 of it was from the 2.5 inches on iron covering the sides. I found no mention as to whether the top of the case mate was covered as well.
So, Now You Know. --B-Runner
The Battle of Fort Fisher, N.C.
