Cool. That would have been the ironclad CSS Missouri, built up the Red River near Shreveport LA. She was armed with weapons taken from the USS Indianola and (I think) the Harriet Lane captured at Galveston. Due to water levels, she was unable to descend the Red River to come to grips with Union vessels, but she functioned as a minelayer; and her presence was probably what caused David D. Porter to bring the big ironclad Eastport up the Red in the 1864 spring campaign, resulting in her loss; so, indirectly, the Missouri helped cause that.