After the defenders in the fire trench are killed, jump in, throw bombs into the dugouts, pursue the enemy into the support and communication trenches. 68.--Organize it against the enemy. Let then the engineers block up to the right and left the captured trench and organize it rapidly against the enemy, making it face about (through changing the parados into a parapet). The enemy is pursued as far as possible and kept away while fatigue parties from the rear bring up all necessary ammunition, sand bags, barbed wire, etc., carrying back all the captured enemy material. Other fatigue parties start at once to connect the former fire trench with the captured trench by communication trenches. FOOTNOTE: [B] Modifications of this formation have since been adopted. Cf. Works cited in preface. CONCERNING ARTILLERY. PRECAUTIONS AGAINST ENEMY'S ARTILLERY. 69.--Artillery Bombardment. Whether preliminary to, in connection with, or independent of an infantry attack, the enemy may make use of his artillery. This bombardment may be directed against the fire trench or back of the fire-trench. 70.--Case I.--Bombardment of the Fire Trench. 71.--All in shelter except sentinels. Leave in the fire trench the necessary sentinels. Station all the other men in the shelters of the support trench, or along the communication trench, if there are no shelters, but fully equipped and ready to jump to their places in the fire trench as soon as the enemy's artillery fire will stop or lengthen to allow his infantry to advance. 72.--Fire to impede observation. All through the bombardment, the sentinels should fire at all objects in the distance which may be used as observation posts. The machine guns should cooperate with a slow sweeping fire. 73.--Case II.--Bombardment back of Fire Trench. 74.--Watch for infantry attack. All should stand to in the fire trench watching for a possible infantry attack and for a possible shortening of the enemy's bombardment. If it occurs, proceed as in Case I. 75.--Prevent observation. Fire against possible observation posts as in Case I. USE OF TRENCH ARTILLERY. 76.--Use with a purpose. Whatever trench artillery appliances are provided, bomb-throwers, trench mortars, catapults, etc., they should never be used hap-hazard, but always with great deliberation and forethought. Have a distinct end in view and watch for the best opportunity to attain it. Such definite aims may be: to interfere with a relief, a fatigue, a trench construction or repair, to destroy accessory defences, etc. 77.--Keep it ready. Let the mortars, etc., be kept loaded and trained on the target selected, ready to be fired instantly. The crews should be near at hand and a sentinel posted to watch for a favorable opportunity. 78.--Save ammunition. Until this opportunity occurs, do not fire. 79.--Have several emplacements.