John Mills as Major Harvey

Cecil Parker as Colonel E.F. Logan

Sid James as Porter YMCA

Bryan Forbes as Butterfield

Barbara Hicks as Hester

Michael Hordern as Governor of Gibralter

Marius Goring as Karl Nielson

Vera Day as Angela

M.E. Clifton James as Himself / General Montgomery

Patrick Allen as Col. Mathers

Patrick Holt as Col. Dawson

Leslie Phillips as Major Tennant

Duncan Lamont as Wing Cdr. Bates

Anthony Sagar as Villa - Guard Sergeant

Kenneth J. Warren as F/O Davies

James Hayter as Sgt. Adams

Brian Weske as Despatch Rider

Harry Fowler as Civilian - End Scene

Bill Nagy as American Captain

Edward Judd as Another Soldier

Victor Maddern as Orderly Sergeant

Desmond Roberts as Brigadier

Victor Beaumont as Gottmann - Commando

Alfie Bass as The Small Man

John Le Mesurier as Adjutant RAPC

Walter Gotell as German Colonel

George Eugeniou as Garcia

John G. Heller as German Sergeant

Frederick Jaeger as Junior German Officer

David Lodge as Sergeant RAPC

MacDonald Parke as American General

Marne Maitland as Arab Proprietor

Maureen Connell as Peggy

Sam Kydd as Go-Between

Allan Cuthbertson as Guards Officer

Ronnie Stevens as MI5 Tail

Steven Berkoff as Minor Role (uncredited)