(c) The next relief will remain within arm's length of the sentry.
(d) Every sentry is to be regularly posted by a N. C. O., who will explain to him his duties and ascertain that the sentry and his relief are aware of the position of the section and platoon commanders, and of the sentries on either side, and whether there are any patrols or working parties out in front.
(e) In important places, i.e., where enemy are suspected of mining, advanced posts, etc., no man should be posted alone. There should be a double sentry.
(f) No man who has been on work during the day will be placed on sentry till he has had at least 4 hours for rest, unless it is unavoidable.
(g) When the line is held by small posts at a considerable distance apart, a visiting patrol will also be maintained. This patrol will be responsible for the passing of orders along the line of posts.
(h) All orders are to be passed along the line by one platoon N. C. O. on duty to the next N. C. O. on duty.
(i) Every sentry is to report when an officer passes his post "all correct" or otherwise.
(j) During daylight no more sentries should be posted than are actually necessary to insure that the whole front to be watched is kept under efficient observation.
(k) Every sentry by day will be provided with a periscope.
3. PATROLS.—(a) It is the duty of troops holding the front line to establish a command of the ground in front of their parapet up to the enemy's wire. This can only be done by active and constant patrolling by night and reconnaissance by day, so that the ground is thoroughly well known to as large a proportion as possible of officers and other ranks, and so that no enemy can move or remain in it by day or night without fear of death.