The lines _must_ be kept clean. Officers will be well advised to assign liberal fatigue work to the men who are guilty of messing up the lines, and littering them with particles of food, papers, cigarette and cigar ends, etc. The regular sanitary squad cannot be expected to do its work unless the soldiers themselves are made to co-operate. It is a good thing to encourage the spirit of rivalry between units, and men can often be jollied on into keeping their lines neat and tidy by pointing out to them lines that are better kept--and sometimes praising them when their lines are up to the required standard. We found that a good many of the men had quite an artistic instinct, and would use up the old bottles and stones from around the camp to execute the most beautiful designs representing the battalion colours or the flags of the allied nations. We also met with considerable difficulty in getting men to thoroughly air the tents. The flaps of round tents should be rolled up just as early as is possible each morning. A good plan is to "strike" individual rows of tents occasionally and give the ground a thorough airing and disinfecting. We followed this plan with tents which contained notoriously lazy men who would not rise at the proper time and developed the habit of leaving the flaps of the tents down. They were awakened by the Orderly Corporal in the usual course of events and given ten minutes in which to appear outside their tents. Promptly at the expiration of this time a squad arrived on the scene and, undoing all their guy ropes, let the tents down very suddenly on their heads. It is very provoking to have a mass of canvas come about your ears in this way, and the slackers soon learned the only way to avoid it. [Illustration: FIGURE 13: Simple loophole made of steel plate and let into parapet.] [Illustration: FIGURE 14: Ordinary hand bomb with fuse lighted automatically as lever is released.]