But in fact it was a prison camp or internment camp, where Guareschi and his fellow soldiers were held by the Germans after the fall of Mussolini. I'm not that up in Italian, but I don't think it's the normal Italian word for camp. I think that using the German word rather than the italian word here would be intended to convey the type of camp it was.
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It's lovely to hear about Alberto and Carlotta, and about Giovanni's comrades still remembering the song.

And I'd love to see and hear "Attesa" - that means "attended" doesn't it?