Nova Scotian https://en.wikipedia.org/wiki/Will_R._Bird wrote a harrowing WWI memoir: Ghosts Have Warm Hands - which includes a pertinent anecdote. He & another soldier were reconnoitering at night between the lines; they had settled in a certain spot to observe, but decided to move up closer to the German trench to listen to a harmonica-player - a fortunate course of action, because no sooner had they settled into their new spot when a shell landed on the one they had just vacated.