While every infantryman receives a certain amount of instruction in grenade throwing, there should be a grenadier squad in each platoon specially instructed and trained in this most effective auxiliary method of trench warfare. Not all men possess the temperament and qualifications necessary to make efficient grenadiers. Hence the personnel of the grenadier squad should be carefully selected. Strong physique, personal courage and steadiness in emergencies are the qualifications that count. Men fond of outdoor sports, other things being equal, will be found the best. The grenadier squad is organized as follows: _Front Rank._ No. 1. First bayonet man. No. 2. Second bayonet man. No. 3. Grenade thrower. No. 4. Squad leader, observer and director. _Rear Rank._ No. 1. First carrier. No. 2. Second carrier. No. 3. Barricader. No. 4. Barricader. [Sidenote: Duties] The duties of the several members of the squad vary under different circumstances of their tactical employment which will be fully explained below. In general they are as follows: _Bayonet Men._—The bayonet men move in advance of the grenade throwers. When the grenade thrower has thrown his grenades into the objective trench the bayonet men must be ready to take instant advantage of the temporary demoralization of the enemy caused by the explosions and clear the way for a repetition of the operation. _Grenade Thrower._—The grenade thrower must be ready and able to throw a grenade at once whenever the bayonet men or squad leader may direct. _Squad Leader._—The squad leader directs the operations of the squad. He goes wherever his presence is necessary. He keeps a close watch to the flanks. He replaces casualties and attends to the forwarding of grenades to the thrower. He acts as a grenade thrower whenever he can assist the operations in that capacity. _Carriers._—The carriers carry as many grenades as possible, and when their supply is exhausted they go to the reserve depots and replenish. They are responsible for a continuous supply of grenades to the throwers. _Barricaders._—The barricaders are charged with the construction of barricades. They carry sandbags and tools for filling them. In addition they carry as many grenades as possible. They hold themselves in readiness to go forward and construct a barricade or cover at any point designated by the squad leader. _General._—All the men of the squad must be trained and prepared to take over the duties of any other member. Before undertaking any operation each man of the squad should thoroughly understand the part he is to play in it. _Formation._—The formation for the several classes of tactical employment will be explained when each is considered below. Offensive Operations