Nicholas Ray
Guy Green (uncredited)
Andrew Marton (uncredited)
Green and Marton completed the film after Ray walked off following a dispute with producer Samuel Bronston and suffered a heart attack shortly after. The "trivia" on IMDb suggests that Marton directed as much as 65% of the film.
During the 1900 Boxer Rebellion, U.S. marine Major Matt Lewis, along with British consul, Sir Arthur Robertson, develop a plan to keep the rebels at bay until an international military relief force can arrive. (from IMDb)