I was introduced to this writing by Mark Twain on Sunday (fittingly, at a church service), and it has been on my mind since. My understanding is that it was written by Twain in 1904 to give voice to his opposition of the Phillipine-American war, but he was unable to get it published. Harper's Bazaar rejected it as being "too radical." It was published posthumously in Harper's Monthly in November, 1916, when the World War gave it new relevance.
I think it also has relevance today.
The War Prayer by Mark Twain