I note that the original message said that the song was "pre-war" -- it's a song written by concentration camp survivors in Nazi Germany. I guess it's "pre-war" in the sense that it was written in the earlier type of labour camp (from which people were indeed sometimes released) rather than the later death camps.

I used to know the German words ("Wir sind die Moorsoldaten..."), but I've forgotten them. I'm very partial to the Home Service recording of the song.

Martin