Butch,
Try this link http://www.rootsweb.com/~txcalhou/hunley.html
or type in "singer submarine port lavaca".
After the Hunley was lost at Charleston, the Singer Submarine Corps a.k.a. Singer Secret Service, moved to Shreveport, and built five subs similar to the Hunley, which operated on the Red River, along with the ironclad Missouri.