Over the Brazier by Robert Graves
THE TRENCHES ( Heard in the Ranks )
Scratches in the dirt? No, that sounds much too nice. Oh, far too nice. Seams, rather, of a Greyback Shirt, And we're the little lice Wriggling about in them a week or two, Till one day, suddenly, from the blue Something bloody and big will come Like—watch this fingernail and thumb!— Squash! and he needs no twice.