22 May 1809 Dartmoor Prison in England was opened to house French prisoners of war.
From Hulk to Convict Gaol , article from Dartmoor Prison Museum     https://www.dartmoor-prison.co.uk/history_of_dartmoor_prison.php

THE DARTMOOR PRISON BREAK  - George Ward       https://www.youtube.com/watch?v=B7oSAIHIb4E

TWENTY ONE YEARS ON DARTMOOR aka TWENTY ONE YEARS   Various recordings on YouTube      https://www.youtube.com/results?search_query=twenty-one+years+on+dartmoor
Twenty One Years , article from Wikipedia    https://en.wikipedia.org/wiki/Twenty_One_Years
Link to post above from henryp TWENTY ONE YEARS ON DARTMOOR aka TWENTY ONE YEARS