Charge of the lancers (1954)

As the Crimean War rages, British Capt. Eric Evoir and Maj. Bruce Lindsey are sent to the Crimea to protect a top-secret cannon capable of blasting through the walls of a nearby Russian fort. Lindsey, unfortunately, is captured by the Russians, who subject him to brutal interrogations. It's up to Evoir to save him. Along the way, Evoir meets a beautiful gypsy girl and begins an affair as intense as the war itself.