This is a document from the NPS put together by Mike Ryan in 1997. This may have been posted here before, but I don't recall it (at this point in time they all begin to blur together
) There are descriptions of the
big guns (and some small) that served as the armament of these two famous forts. One of the things that interested me most in this PDF is that it contains a list of Army & Navy 100-pdr Parrott failures [pp. 59-61].
http://www.nps.gov/fosu/historyculture/upload/392-D124---Scanned%20Images-53448.pdfI've always found the imagery in this photo to be slightly incongruos; reason would suggest that you should be looking at a 'big gun' where the mt. howitzer is perched [pp.68-69].
Charleston, S.C., breach patched with gabions on the north wall of Fort Sumter.