This true story follows the exploits of a top-secret British military mission to destroy Nazi radio ships in a neutral harbor during WWII. The daring plan is led by British Intelligence officers Col. Lewis Pugh (Gregory Peck) and Capt. Gavin Stewart (Roger Moore). Since the ships are in neutral territory the British Military command, while encouraging the scheme, must deny any knowledge of it if it fails. Pugh and Stewart enlist the aid of retired officer Col. Bill Grice (David Niven) and some of his former soldiers. On the pretext of being on a fishing expedition, these seemingly drunken old men in civilian clothing must board and destroy 3 Nazi ships, whose radio transmissions have resulted in Nazi submarines sinking allied ships. While Stewart arranges a diversion onshore, Pugh and Grice carry out the dangerous raid on and destruction of the Nazi ships.
Elenco: Gregory Peck , Roger Moore , David Niven , Trevor Howard , Barbara Kellerman , Patrick Macnee , Kenneth Griffith , Patrick Allen , Wolf Kahler , Robert Hoffmann , Dan van Husen , George Mikell , Jürgen Andersen , Bernard Archard , Martin Benson , Percy Herbert , Donald Houston , Glyn Houston , Terence Longdon , Allan Cuthbertson , Faith Brook , John Standing , Graham Stark , Jack Watson , Moray Watson , Michael Medwin , William Morgan Sheppard , Patrick Holt , Clifford Earl , Keith Stevenson , Brook Williams , Victor Langley , Marc Zuber , Mohan Agashe .