Unattributed writing credit.
Although it wasn't credited, this film follows the plot of a novel by R.C. Sherriff very closely indeed. Sherriff is better known as a playright (especially for "Journey's End" and a scriptwriter. The novel was called "The siege of Swayne Castle". (ISBN 0-00-671056-5) it was printed in paperback as a children's tale in 1975. The film was released 10 years earlier... One has to wonder which came first. Sherriff's plot idea, or the movie. If anyone out there knows....
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