It's another attempt at Peter and Bunter sitting in a shell-hole - I'm convinced there's a story to be told with that setting, if only I can find it - but the backstory is that they're on their way back from that mission where Peter is disguised as a German officer, and I'm damned if I can find convincing way of fitting that in, without it being all "As you know, Bob..." (or, indeed all, "As I absolutely shouldn't tell you, Sergeant, seeing as you don't have security clearance...").

I have done the angsty mud bit, and that works quite well (insofar as one can ever tell these things) but the plot is proving a real bugger.