In regard to this thread, there is a song entitled "Willie McBride's Reply" which is sung and played to the same tune as "No Man's Land: The Green Fields of France.

I often use war-theme songs to get across the message to kids I teach around ANZAC time here in Oz and around Remembrance Day as well.
This one is great as it deals with the WHY's of going to war - especially if you didn't have to.

PS - TRIVIA: Willie McBride actually existed, too. He was Pvte William McBride; Service Number - 21406 of the Royal Inniskillen Fusiliers and was killed on 10 / 2 - 16, probably in a skirmish following the Battle of Loos or in the early 'manoeuvrings' prior to the campaign for the Somme.

On a lighter side: there's always the Royal Guardsmen's "Snoopy versus the Red Baron" series :-)