Barrand and Roberts, two expatriate Brits living in the US recorded a great war Trilogy on their album A PRESENT FROM THE GENTLEMEN.The afore-mentioned The Old Barbed Wire is sandwiched between The Valley of the Shadow, a more recent song about the Battle of Arras, and There's a Long, Long Trail, a marching song composed in 1913 by Zo Elliot and Stoddard King.I also vaguely remember hearing a song called Roses of No Man's Land, about Red Cross Nurses. For a modern song about a unique event during ww1 check out Christmas in the Trenches by John McCutcheon.