Yangtse Incident: The Story of HMS Amethyst is a 1957 British war film starring Richard Todd (The Dam Busters) that tells the story of the British frigate HMS Amethyst caught up in the Chinese Civil War. It was based on the book written by Lawrence Earl. The film was known in the US by the alternative titles Battle Hell, Escape of the Amethyst, Their Greatest Glory. The film was entered into the 1957 Cannes Film Festival. The rivers Orwell and Stour - which run between Ipswich and Manningtree, in Suffolk, England - doubled as the Yangtze River during the making of this film. The Chinese PLA gun batteries - depicted by old Royal Navy field guns on land carriages - were deployed on the sloping banks of the Boys' Training Establishment HMS Ganges which was sited at Shotley Gate, facing Felixstowe on the Orwell, and Harwich on the Stour. The realism of the battle scenes are impressive and the landscapes look most authentic giving much credit to the art director and production designers.
Yangtse Incident (1957)   http://www.imdb.com/title/tt0051209/