(d) The N. C. O. coming on duty will go around and post new sentries with the N. C. O. coming off duty.
(e) The length of each tour of duty will naturally depend on the number of officers and N. C. O.'s available in the company. Normally each tour should be, by night 2 hours, by day 4 hours, day commencing at morning "stand to" and night commencing at evening "stand to." In inclement weather the tour of duty must be reduced.
(f) N. C. O.'s after posting sentries will report "all correct" or otherwise to the officer on duty.
(g) Men will be warned for duty by the platoon sergeant on duty. This will be done at evening "stand to."
(h) On being detailed for duty a man will be informed at which hours he will come on duty.
(i) Except under special circumstances, such, for instance, as a sentry being killed or wounded, no sentry will be relieved by another man unless the relief is properly carried out in the presence of a N. C. O.
(j) When possible to do so, notice boards will be placed in each sections' trench, on which will be pinned daily all orders regarding working parties and a list of the men in the section giving the times at which they will come on sentry and other duties.
(k) The company commander will be responsible for sending in the reports required by battalion H. Q.
2. SENTRIES.—(a) The number of sentry posts required depends on the propinquity or otherwise of the enemy, the strength of obstacles, the ease with which sentry posts can be reinforced, and other local conditions. There must be sentries enough to insure that the alarm is given promptly in case of attack, and that local resistance is sufficient until support can arrive. Brigade commanders are responsible that these requirements are met.
(b) Sentries will be relieved every two hours, except under bad weather conditions, when the length of a tour of sentry duty will be reduced.