Interesting, did BB write it or lift it. It turns up as quotations in Eric Hiscox memoirs, and (I think) in "With a Machine Gun to Cambrai (sic)" Memoirs of an infantry man." Will have to be checked in a Libuary Index. Wasn't Partridges Memoirs of the Trenches entitled "The bells of Hell" ?I vaugley recall it in Joan Littlewoods "Oh What a lovely War" the film version.
Not that it matters overmuch - suspect that whoever the author was, it fitted the theme.
Not intended as a flame, more an explore the sources, I can see Saturday Afternoon is going to b spent in Cardiff Libuary researching !!
Gareth