Working still on your daylight scheme show your non-commissioned officers and men how to make night obstacles in addition to those meant for daylight defence, which latter may be any distance up to one hundred yards in front of the trenches. The night obstacles, on the other hand, should be quite close, the fire obstacles as close as ten yards, the bayonet obstacles, say a narrow ditch and a wire, close under the trenches so as to make a man stumble when trying to reach the defender with his bayonet. Make or plan these arrangements round the pivots, and then practise blocking and defending paths or roads by the same methods as for pivots, but with this variation, that a parapet which can only be used for defence at night may be as high as you consider needful without paying regard to its invisibility, while those to be used by day are kept as low as possible. In a practical exercise the men to hold these night posts would have to be furnished either from your support or by thinning some of the pivots. Yet the most carefully arranged trenches and obstacles will be of no value unless the men occupy them in time to avail themselves of their advantages. Time sufficient to allow of this, must be got by patrolling in front as for outposts, by making automatic alarms in front of the obstacles (M.F.E., 55 (12)), by having alert sentries on the defence line, and by having a good and well understood arrangement of alarm posts by which each man shall be ready to occupy at once, in silence, and without confusion, the place which has been assigned to him. Patrolling has been dealt with under “Outposts,” the alertness of your sentries will depend largely on the state of discipline to which you have brought your company, and on the commonsenseness, to coin a word, of their training. Alarm posts are practised in the same way as on outpost. In many corps it is a standing order that when in camp or bivouac, on manœuvre as well as on service, men are to fall in on their alarm posts once a day, the usual times being at retreat or on arrival in camp (F.S.R., 48 (2)), and this is done whether in Brigade (F.S.R., 47 (2)) or not. If such is the order in your battalion, adhere to it within your company when detached, if not, do it off your own bat. It does not fatigue the men and ensures attention being paid on all occasions to this important duty. EXERCISE XVI. HASTY EXPEDIENTS.