The image is a photograph of a sign on a white wall. The sign is rectangular in shape and has black text written on it. The text reads "Dahlgren Boat Howitzer Mounted on its original field carriage, this 12 pounder Boat Howeitzer was served on the U.S.S., Pittsburgh, sister of Cairo. The fate of Cairo's boat Howeitzer, identical to this one, remains unknown. It appears that Cairo's Howeitzer has removed prior to its rendezvous with destiny on the Yazoo River." The sign appears to be a historical marker or plaque.