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Operation Crossbow

Operation Crossbow (later re-released as The Great Spy Mission) is a 1965 British spy thriller film directed by Michael Anderson and starring Sophia Loren, George Peppard, Trevor Howard, John Mills, Richard Johnson and Tom Courtenay. The screenplay was written by Emeric Pressburger (under the pseudonym Richard Imrie), in collaboration with Derry Quinn and Ray Rigby, from a story by Duilio Coletti and Vittoriano Petrilli. It was filmed in Panavision and Metrocolor at MGM-British Studios.

Plot

In 1943, Nazi Germany is developing the V-1 flying bomb and V-2 rocket. Technical issues with the V-1 lead the Germans to create a crewed version for flight testing, but the test pilots die flying it. Eventually, aviator Hanna Reitsch successfully flies the prototype, and realises that mechanical shifting of the missile's weight and change of speed requires the trim controls to be changed.