The first I really remember is "Johnny I Hardly Knew Ye." But there are so many: for something seasonal how about Jonah Lewey's " Wish I could be home for Christmas" or John Lennon's " Happy Xmas, war is over."

And as to whether the songs fail; well there are more people opposed to war now than ever before but the dangers of complacency are as great as ever. There are always waves in peoples attitudes but it is important to keep the head of pressure acting in the right direction.
love Robbie