 John ClementsMilos Petrovitch | Milos Petrovitch |
 Tom WallsKossan Petrovitch | Kossan Petrovitch |
 Rachel ThomasMaria Petrovitch | Maria Petrovitch |
 Stephen MurrayDr. Stephan Petrovitch | Dr. Stephan Petrovitch |
 Mary MorrisAnna Petrovitch | Anna Petrovitch |
 Godfrey TearleGeneral von Staengel | General von Staengel |
 Robert HarrisCol. Von Brock | Col. Von Brock |
 Michael WildingConstantine | Constantine |
 Charles VictorSergeant | Sergeant |
 Niall MacGinnisDr. Jordon | Dr. Jordon |
 Ivor BarnardStation Master | Station Master |
| BBen WilliamsDragutin | Dragutin |
 George MerrittA Yugoslav General | A Yugoslav General |
 Stanley BakerPetar | Petar |
| TTecwyn JonesDanilo | Danilo |
| EEynon EvansLieut. Banse | Lieut. Banse |
| NNorman PierceLieut. Franke | Lieut. Franke |
 Eric MicklewoodLieut. Von Klotz | Lieut. Von Klotz |
 Finlay CurriePriest (uncredited) | Priest (uncredited) |
| GGina EvansWoman (uncredited) | Woman (uncredited) |
 Herbert LomasSchoolteacher (uncredited) | Schoolteacher (uncredited) |
 John SlaterMinor Role (uncredited) | Minor Role (uncredited) |
| BBrynmore ThomasMinor Role (uncredited) | Minor Role (uncredited) |
| JJohn WynnYugoslav Soldier (uncredited) | Yugoslav Soldier (uncredited) |
