(_b_) By night the officer and N. C. O. on duty will frequently patrol the trench line to see that the sentries are alert and to inquire whether they have any information to report about the enemy.[1] (_c_) The N. C. O. coming on duty will go round and post new sentries with the N. C. O. coming off duty. (_d_) The length of each tour of duty will 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 by night commencing at evening "stand to." In inclement weather it may be advisable to reduce the tour to 1 hour. (_e_) N. C. O.'s after posting sentries will report "All correct" or otherwise to the officer on duty. (_f_) The officer on duty will be responsible for sending in the reports required by battalion headquarters, unless there is anything unusual to report, when this duty will be performed by the company commander. (_g_) Men will be warned for duty by the platoon N. C. O. 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_) When possible to do so, notice boards will be placed in each section's 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 duty. (_j_) 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. =2. SENTRIES=--=By night.=--(_a_) Sentries will be posted every 2 hours, except under bad weather conditions, when the length of the tour of sentry duty may be reduced. (_b_) From evening "stand to" till morning "stand to" one sentry to every four men will be posted. If wiring or digging parties are out in front, or listening posts are numerous, this number may be reduced. (_c_) The next relief will remain within reach of the sentry. (_d_) Every sentry is to be regularly posted by a N. C. O., who will explain to him his duties and the front to be watched, and ascertain that the sentry and his relief are aware of the position of the section and platoon commanders, the sentries on either side, and whether there are any patrols or working parties out in front. Should there be salients in the line, the sentry will be carefully instructed, so as to avoid any possibility of him firing toward his own trenches. (_e_) By night or in places which have the reputation of being dangerous, _i.e._, where enemy are suspected of mining, advanced posts, etc., no man should ever be posted alone. There should either be a double sentry post or the next relief should rest within kicking distance of the sentry.