- Suzy Kendall
- Fraülein Doktor
- Kenneth More
- Col. Foreman
- Nigel Green
- Col. Mathesius
- Alexander Knox
- Gen. Peronne
- Olivera Katarina
- Marchioness de Haro
- Capucine
- Dr. Saforet
- James Booth
- Meyer
- Andreina Paul
- Dona Elena de Rivas
- Silvia Monti
- Margarita
- Virginia Bell
- Dona Julia
- Giancarlo Giannini
- Hans Ruppert
- Mario Novelli
- Sgt. Otto Latemar
- Roberto Bisacco
- Schell
- Milivoje Popovic-Mavid
- Chaplain
- Janez Vrhovec
- Belgian Colonel
- Milutin Micovic
- Blondel
- Dusan Bulajic
- Col. Delveaux
- Gérard Herter
- Capt. Munster
- James Mishler
- Gen. von Ludendorff
- Ralph Nossek
- Lean Agent
- Michael Elphick
- Tom
- Bernard De Vries
- Lt. Wilhelm von Oberdorff
- Malcolm Ingram
- Cartwright
- Mihajlo 'Bata' Paskaljevic
- Wounded English soldier
- John Atkinson
- Maj. Rops
- Dusan Djuric
- Aide to Ludendorff
- Joan Geary
- Landlady
- Milan Jelic
- (uncredited)
- Zoran Longinovic
- Wounded English Soldier
- Predrag Milinkovic
- Customs Officer
- György Nagyajtay
- Chilean Ambassador
- Tihomir Pleskonjic
- Officer
- Kenneth Poitevin
- Lt. Ernest Wiechert
- Maggie Rennie
- Mrs. MacPherson
- Ljubo Skiljevic
- (uncredited)
- Neale Stainton
- Sergeant
- Aleksandar Stojkovic
- Chemist
- Colin Tapley
- Gen. Metzler
- Nikki Van der Zyl
- Fraülein Doktor
- John Webb
- Agent #1
- Walter Williams
- Gen. von Hindenburg