19.—What is expected of the men in the listening posts?
20.—When should the sentinels fire on a clear night? When, on a dark night?
21.—What should the sentinels do, if they hear the enemy's digging?
22.—When and where are sharpshooters posted and what is their duty?
23.—What information may patrols bring back?
24.—When should patrols be sent out and how should they be assigned?
25.—What should the sentinels along a sector know about the patrols, and the several possible patrols know about one another?
26.—Describe dress and equipment of men on patrols.
27.—Describe their method of advance.