It was directed by (British and French exteriors), (American exteriors), and (German scenes). The screenplay was by Ryan, with additional material written by, David Pursall and Jack Seddon. The film was produced by, who paid author Ryan $175,000 for the film rights. The Longest Day is a 1962 based on 's 1959 book (1959), about the landings at Normandy on June 6, 1944, during.
