Michael Goodliffe who plays Robie was actually a POW in a German POW camp during the Second World War.
Doctor:
Ah, Beethoven. He is a good German.
Prisoner:
Yes. He's dead.
Whilst the escape is in progress, there is a quick shot of a German guard near the compound fence. His rifle has a British pattern webbing sling; the upper brass buckle can be seen clearly.
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