On July 18, 1863, Brigadier General George Crockett Strong ordered an attack by Chatfield in cooperation with Haldimand S. Putnam, Quincy Adams Gillmore, Robert Gould Shaw, and Truman Seymour on Confederate Fort Wagner on Morris Island, South Carolina south of the harbor at Charleston, South Carolina. While leading his men in an attack on the Fort's front, Chatfield was mortally wounded. He was pulled out of action and returned to Connecticut.