633 Squadron is a 1964 war film directed by Walter Grauman and starring Cliff Robertson, George Chakiris, and Maria Perschy. The plot, which involves the exploits of a fictional World War II British bomber squadron, was based on the 1956 novel of the same name by former Royal Air Force officer Frederick E. Smith, which itself drew on several real RAF operations. The film was produced by Cecil F. Ford for the second film of Mirisch Productions UK subsidiary Mirisch Films for United Artists. 633 Squadron was the first aviation film to be shot in colour and Panavision widescreen. Plot After the Norwegian resistance leader Royal Norwegian Navy Lieutenant Erik Bergman travels to Great Britain to report the location of a German V-2 rocket fuel plant, the Royal Air Force's No. 633 Squadron is assigned to destroy it. The squadron is led by Wing Commander Roy Grant, a former Eagle Squadron pilot (an American serving in the RAF before the US entered the war). The plant is in a seemingly impregnable location beneath an overhanging cliff at the end of a long, narrow fjord lined with numerous anti-aircraft guns. The only way to destroy the plant is by bombing the cliff until it collapses and buries the facility, a job for 633 Squadron's fast and manoeuvrable de Havilland Mosquitos. The squadron trains in Scotland, where there are narrow glens similar to the fjord. There, Grant is introduced to Bergman's sister, Hilde. They are attracted to each other, despite Grant's aversion to wartime relationships. The Norwegian resistance has to destroy the anti-aircraft defences immediately before the attack. When unexpected German reinforcements arrive, Bergman returns to Norway to try to gather more forces. He is captured while transporting desperately needed weapons, taken to Gestapo headquarters and tortured for information. Since Bergman knows too much, he must be silenced before he breaks. Grant and newly married Pilot Officer Bissell are sent in with a single Mosquito to bomb the Gestapo building. Though they are successful, their shot-up Mosquito fighter-bomber crashes on its return; Bissell is wounded and becomes blind. A tearful Hilde thanks Grant for ending her brother's suffering. Still worried, Air Vice-Marshal Davis decides to move up the attack to the next day. The resistance fighters are ambushed and killed, leaving the defences intact. Although Grant is given the option of aborting, he decides to press on. The factory is destroyed at