Any observations of enemy activities, of any nature whatever, are reported immediately so that they may be passed on to the commander whose unit is manning the trenches directly opposite the same.
Loopholes should be screened at the rear by a sandbag split and hung over them. They should be carefully concealed to prevent their location being discovered by the enemy. There must be no alteration in the parapet where they are located.
Plate 45.—Looking-glass periscope.
Plate 45a.—Trench showing wire overhead cover and wire trapdoor obstacle. Machacoulis gallery in background.
Snipers