The clearing of communication trenches is effected much in the same manner as explained for the fire trench. The grenadier squad is organized and formed in the same manner. The squad works its way into the communication trench by bombing each leg until they arrive at a point where the formation, as illustrated in Plate 41, can be assumed. The grenade thrower throws grenades into the trench at _B_ and then at _C_. As soon as these have exploded the bayonet men take advantage of the confusion to advance into the leg _A-B_ under cover of the shoulder _b_, the squad leader and thrower advance to _A_, the carriers to the point formerly occupied by the squad leader, and the barricaders to the point formerly occupied by the carriers. The thrower then puts grenades into the trench at _C_ and then at _D_, after which the whole squad advances another notch as formerly explained. Where island traverses are encountered the thrower puts a grenade on each side of the traverse and one in the rear of it. The bayonet men, one on a side, assault around the traverse and meet on the far side, and the operation proceeds as heretofore explained. Night Operations The grenadier squads may be called upon at night, to perform any of the services that are theirs by day, and in addition may be called upon to make night reconnaissances. For this work the men must be able to organize and reorganize the squad quickly and noiselessly. The throwers must be particularly efficient. There must be the highest order of team work. [Sidenote: Grenadier Patrols] Grenadier patrols are sent out at night to make reconnaissances of the enemy’s lines with a view to getting information which may include: 1. Location and organization of line. 2. The length of line occupied. 3. Numbers and disposition of occupying troops. 4. To get an accurate description of the ground. 5. To locate observation and listening posts or any other advanced positions. 6. To locate machine guns. These patrols may consist of from two men to the entire grenadier squad. In a patrol of six or eight men two of them carry rifles and belts, bayonets fixed. The remaining members of the patrol carry no equipment except a haversack filled with grenades. The grenades are used only in case of emergency. It is a reconnoitering patrol charged with gaining information and therefore does not enter into an encounter with the enemy except as a last resort. The men move or crawl without noise and take advantage of all cover that the ground affords. If they suspect they are observed, they should “freeze” to the ground and remain absolutely motionless. On dark nights it is easy to lose the direction and for the men to lose one another. Every device or scheme to lessen risks in this respect must be employed. The men may tie themselves lightly together so they will not proceed in a bunch and at the same time retain connection with each other. Notes on Grenade Warfare