By Army War College
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Extra info for Notes On The Construction And Equipment Of Trenches (1917)
Their protection is assured by their invisibility. The retreat of the observers is protected by a system of branch galleries whose entrance into the main gallery can be closed rapidly, or by a barbed-wire pro tection placed over the sap. The lookouts in small posts are placed in very short trenches, which are provided with loopholes. Pro tection at short range against grenades is secured by a network cf wire. Observation on the firing line is effected by lookout posts organized preferably at the salients where the view is more extended.
The men must keep abso lute silence, lie down immediately on the ground when rockets appear, and resume their work when the light has disappeared. (See E. F. , par. ) 80. —The digger left to his own devices will make the bottom of the communicating trench concave; the mud will then settle to the center which the men's feet will soften and gradually wear down. When the trench is cleaned the mud will be taken out in a series of holes along the center, making walk ing very difficult. This is a detail that should be insisted on when work is going at a high rate in the first line and a shift of workers is on every night.
86. —During a bombardment, the mainte nance of lines of information becomes very difficult, but it must be accomplished by all possible methods, such as: (a) Installing telephones under strong shelters. (b) Using lead-covered cable, buried 6 feet deep, especially for the lines connecting the regimental, brigade, division, and corps headquarters. (c) Placing rockets in all shelters and observatories where officers or noncommissioned officers are posted. (d) Preparing posts for visual signaling, safe from bombardment and defiladed from view of the enemy.