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
George Chakiris
Maria Perschy
Harry Andrews
Donald Houston
Michael Goodliffe
John Meillon
John Bonney
Angus Lennie
Scot Finch
John Church
Barbara Archer
Sean Kelly
Julian Sherrier
Geoffrey Frederick
Johnny Briggs
Suzan Farmer
Anne Ridler
Peter Kriss
Cavan Malone
Richard Shaw