When Norwegian resistance leader Lieutenant Erik Bergman reports the location of a German V-2 rocket fuel plant, the Royal Air Force's 633 Squadron is assigned the mission to destroy it. The plant is in a seemingly-impregnable location beneath an overhanging cliff at the end of a long, narrow fjord lined with anti-aircraft guns. The only way to destroy the plant is by collapsing the cliff on top of it.

Cliff Robertson

Wing Commander Roy Grant

George Chakiris

Lieutenant Erik Bergman

Maria Perschy

Hilde Bergman

Harry Andrews

Air Vice-Marshal Davis

Donald Houston

Group Captain Don Barrett

Michael Goodliffe

Squadron Leader Frank Adams

John Meillon

Flight Lieutenant Gillibrand

John Bonney

Flight Lieutenant Scott

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