Northwest Outpost

Northwest Outpost (also known as End of the Rainbow) is a 1947 American musical film directed by Allan Dwan and starring Nelson Eddy, Ilona Massey and Joseph Schildkraut. The film was Eddy's last, and is an operetta film like his previous starring roles. He was persuaded to make it by Republic Pictures because Rudolf Friml was writing the score. It was well received by critics and had a strong box office performance.
Synopsis.
The film is set at the Russian imperial post at Fort Ross in California in the early Nineteenth Century. A visiting American army officer becomes romantically involved with an aristocratic woman whose criminal husband is being held as a prisoner at the Fort.