One song which I don't think has been mentioned, I'm not sure if it originated in WW1 or 2, would be "Ich haben ein kameraden" (Apologies for any incorrect spelling/tense etc), I thought it might be in the DT but couldn't find it. Any chance of posting the lyrics Wolfgang? I was also going to mention "Wacht am Rheine", but Tom beat me to it.

Pete M