FIELD ARTILLERY COOPERATION.
82.—Communications with the artillery.
Should be permanent so that it may cooperate whether to repulse an enemy's attack, to silence his artillery, to damage his defences or to prepare and protect an attack or a counter attack.
83.—Observations posts.
To avoid a waste of ammunition, and attain the desired result as well as to prevent the artillery fire from falling short upon one's own trenches, artillery observation posts should be provided in the fire trench or at one of the outposts.
84.—Artillery fire falling short.
In case artillery fire does fall short upon one's own trenches, communicate at once with artillery commander and proceed as when bombarded by enemy. (Cf. [69] ff.)
85.—Artillery preparation of infantry attack.
Special caution should be exercised in the case of a raid against the enemy's trench. Make sure that the artillery preparation has secured the desired result. Synchronize carefully the infantry advance and the lengthening of the artillery fire.