This is a beautiful song. Very sad. German, but found in many languages. French, Spanish, Polish, Dutch, Finnish I have found so far.

It is in many versions on You-tube. One of the saddest was where they just showed pictures of the graves of the soldaten.

And before anyone chimes in with war mongering etc., we can not recover from wars, and possibly we can not prevent further ones from happening if we do not allow partiuclarly the vanquished to just simply say how sad they are and how they miss the people who died, worthy cause or not.

I will try to assemble a few in the various languages unless someone beats me to it. mg