* Robert Mitchum as Lt. Col. "Casey" Jones
* Peter Graves as Captain "Tony" Carradine
* Robert Ryan as General "Red" Harris
* Ingrid Thulin as Countess Francesca "Fran" di Rossi
* Earl Holliman as Sergeant "Duke" Johnson
* Arlene Dahl as Countess Giovanna "Gigi" di Rossi
The film also featured a large cast of supporting actors.