Four monitors laid up in the Anacostia River, off the Washington Navy Yard, circa 1866. Ships are (from left to right): USS Mahopac, USS Saugus, USS Montauk (probably); and either USS Casco or USS Chimo. Photo mounted on a stereograph card, marked: Photographed and published by Kilburn Brothers, Littleton, N.H.". Courtesy of Paul H. Silverstone, 1982. U.S. Naval History and Heritage Command Photograph.