1. Constant battle with the elements, care for drainage, revettment, sanitation and storage. 2. Repair of the effects of bombardment. 3. New work, for better security, communication and observation. 4. Work in the open. (a) Usually consists of repair or rearrangement of wire entanglements, digging new listening posts, etc. (b) Effected by parties detailed by roster. (c) They are guarded by fighting patrols, composed like reconnaissance patrols. Their best protection is in silence and concealment. (d) Adjoining companies must be notified of their dispatch, location and probable time of return. (e) This work, like all operations conducted outside the protection of the trenches, offers a valuable tonic to the morale. G. OFFENSIVE OPERATIONS: 1. Sniping: (a) Snipers constitute one of the most dependable and productive agencies of attrition. (b) The best shots of the company are especially trained and assigned for this duty exclusively. (c) They operate in pairs and post themselves to cover any exposed portions of the enemy's trenches, especially his communicating trenches. (d) They should be well supplied with all necessary special equipment; _e.g._, sniperscopes, telescopic sights, painted headgear, etc. 2. Mining Operations. 3. Raiding: (a) Object of raids: destruction of the enemy's defenses, disturbance of his morale, collection of prisoners and information. (b) The personnel of raiding parties will usually include: A commander and second in command, bayonet men, bombers, engineers, signal men, stretcher bearers. Their numbers and proportions are regulated by the nature and difficulty of the task. (c) Co-ordination with the artillery barrage is the essential of their success. The limit of advance, extent of operations, and time of return will therefore be set in advance and rigidly adhered to. H. ROLE OF THE TRENCH COMMANDER: