Dark of the Sun (also known as The Mercenaries in the UK) is a 1968 adventure-war film starring Rod Taylor, Yvette Mimieux, Jim Brown, and Peter Carsten. The film, which was directed by Jack Cardiff, is based on Wilbur Smith's 1965 novel, The Dark of the Sun. The story about a band of mercenaries sent on a dangerous mission during the Congo Crisis was adapted into a screenplay by Ranald MacDougall. Critics condemned the film on its original release for its graphic scenes of violence and torture. Sometime in 1964 or 1965, mercenary Bruce Curry (Rod Taylor) is hired by Congolese President Ubi (Calvin Lockhart) supposedly to rescue the European residents of an isolated town about to be attacked by rebel Simbas. But in reality his pressing mission is to retrieve diamonds, worth fifty million dollars, from a mine company's vault. Curry's subordinates include his friend Ruffo (Jim Brown) and alcoholic Doctor Wreid (Kenneth More). Reluctantly he also takes ex-Nazi Henlein (Peter Carsten) on the mission because he needs his military expertise and leadership skills. The Congolese president provides Curry with the use of a steam train along with government soldiers.