http://collections.mfa.org/internal/media/dispatcher/774771/resize%3Aformat%3DfullAdmiral Porter's Gunboats Passing the Red River Dam, Louisiana1864James Madison AldenWatercolor and ink over graphite on paperThrough opening in dam left gunboat moving down river, rest of flotilla to follow.Watercolors40.2000000000 Centimeterhttp://collections.mfa.org/objects/174025/rdf