"Camouflage" is that which conceals: it is a fraud, and speaketh not the truth. I am not even certain whether it is a noun or a preposition, but the point is immaterial. Along with other canons of military matters, its virtue lies in its application rather than in its etymology. What the eye doth not see the trench mortars do not trouble is as true to-day as when Noah first mentioned the fact; and camouflage is the application of this mighty dictum.
The value of any particular piece of camouflage depends entirely on its capability for deceit; but to the youthful enthusiast I would speak a word of warning. I have in mind the particular case of young Angus MacTaggart, a lad from Glasgow, with freckles and a sunny disposition. He was a sapper by trade, and on his shoulders there devolved, on one occasion, the job of covering a trench mortar emplacement with a camouflage of wire and grass which would screen the hole in which sat the mortar from the prying gaze of Hun aeroplanes. It was a deep hole, for the mortar was large; and the screen of wire was fastened to a framework of wood. When the gun wished to do its morning hate, a pessimistic individual first scoured the heavens with his glasses in search of Hun planes. If the scouring revealed nothing, the screen was lowered, and the gun was made ready. Then the detachment faded away, and the gun was fired by a man of great personal bravery by means of a long string. Ever since the first trench mortars, which consisted of a piece of piping down which a jam-tin bomb was dropped, in the hopes that when the charge at the bottom was lighted, the bomb would again emerge, I have regarded trench mortars as dangerous and unpleasant objects, and the people who deal with them as persons of a high order of courage. One remembers the times when the bomb did not emerge, but stuck half way and exploded violently; one remembers when the entire gun fell over and propelled the bomb in the direction of battalion headquarters; above all, one remembers the loathing and contumely with which the mere arrival of the trench mortar in any part of the trenches was greeted. Then there was no attempt at camouflage; one's sole endeavour was to avoid being killed by the beastly thing.