Turning our spitfires to face them

Set in a prison camp in Nazi Germany in 1944. The movie, frankly, has cheapness and amateurism written all over it. It looks like they built up the set at some piggery somewhere, filled it up with drama school drop-outs and hoped it looks like an authentic prison camp. And the story, well, apparently the prisoners in those places hunted cats, built radios, knitted socks and particularly made violins to kill time. Must have been fun times. Based on actual events, so it's gotta be true. Not that bad a movie though, but leaves something to be desired.