H. Hesketh-Prichard, Sniping in France — CHAPTER VI. AN OBSERVER'S MEMORIES
“ There was another post which we used for a long time, the only road to which lay along a disused trench in which were several deep shell holes. As this trench was fall of a kind of thick dust or mud according to the weather, and as the whole length of it had to be passed over by crawling there was great fear that the trails of the observers would one day be photographed from the air. At one point, therefore, an entrenching tool was left with which each observer obliterated his trail as far as he could. One becomes very careful in these small details when- one's life hangs upon the issue. ”
