Synopsis
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.
Cast

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

Angus Lennie
Flying Officer Hoppy Hopkinson
Scot Finch
Flying Officer Bissell
John Church
Flying Officer Evans
Barbara Archer
Rosie, barmaid at the Black Swan Inn
Sean Kelly
Lieutenant Nigel
Julian Sherrier
Flight Lieutenant Singh
Geoffrey Frederick
Flight Lieutenant Frank

Johnny Briggs
Lieutenant Jones

Suzan Farmer
WAAF Sergeant Mary Blake / Bissell
Anne Ridler
SS Interrogator
Peter Kriss
Lieutenant Maner (uncredited)
Cavan Malone
Ericson, Norwegian Resistance (uncredited)
Richard Shaw
Johanson, Norwegian Resistance (uncredited)
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