Overhead cover may be provided as shown in Plates 19 and 20.
Loopholes are made wherever head cover is provided. Where the enemy's trenches are close, there is considerable danger in using them. Collective firing takes place over the parapet. When loopholes are used they should face half-right or half-left and not directly to the front.
Plate 16.—Method of draining trench.
Plate 17.—Details of trench drainage.
