"I'm sorry, I can't understand a word you say." The explanation reads: "There was almost always an acute shortage of fuel for cooking Red Cross food. Any opportunity of "scrounging" wood or coal was quickly grasped. First arrivals at a new camp were fortunate in being able to obtain a good store of wood left lying around by the builders."
This illustration is taken from "Handle With Care" by R. Anderson and D. Westmacott, a book of sketches made by Prisoners of War.