There's a most excellent and grim song about young deserters "For the Sake of Example" written by the House Band - discussed here on the Mudcat:

http://www.mudcat.org/thread.cfm?threadid=60894

There is an organizations trying to secure posthumous pardons for all the young men shot "For the Sake of Example" during WWI - you can read some interesting articles about the history of this abominable policy here:

http://www.shotatdawn.org.uk/

Coope, Boyes and Simpson have written many songs about WWI for their performances at the Peace Concerts - check out the No Masters web site for a list of albums:

http://www.nomasters.co.uk/

and their website for a discussion of their work:

http://www.coopeboyesandsimpson.co.uk/the_first_world_war.htm

I particularly like Lester Simpson's "Standing in Line", too...