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
as Wing Commander Roy Grant
George Chakiris
as Lieutenant Erik Bergman
Maria Perschy
as Hilde Bergman
Harry Andrews
as Air Vice-Marshal Davis
Donald Houston
as Group Captain Don Barrett
Michael Goodliffe
as Squadron Leader Frank Adams
John Meillon
as Flight Lieutenant Gillibrand
John Bonney
as Flight Lieutenant Scott
Angus Lennie
as Flying Officer Hoppy Hopkinson
Scot Finch
as Flying Officer Bissell
John Church
as Flying Officer Evans
Barbara Archer
as Rosie, barmaid at the Black Swan Inn
