Original Australian Daybill movie poster.Circle of Iron is a 1978 martial arts and fantasy film co-written by Bruce Lee, who intended to star in the film himself, but died before production. The film is also known as The Silent Flute, which was the original title of the story conceived by Bruce Lee, James Coburn, and Stirling Silliphant in 1969. Bruce Lee envisioned his film as an entertaining introduction to Eastern philosophy, as well as martial arts. After Lee's death in 1973, Silliphant and Stanley Mann completed the screenplay, and Lee's part was given to the Kung Fu television star, David Carradine. Many other well-known character actors also had small roles in the film, including Roddy McDowall, Eli Wallach, and Christopher Lee.