44.—Pretend a raid.
On dark nights, have all firing stop. Throw stones by hand or with slings, a dozen at a time toward the enemy's trench. This will lead him to fire repeated volleys and waste ammunition in his fear of an attack, especially if the trenches are in wooded terrain and there are leaves on the ground. Repeat several times during the night.
Patrols may also tie strings to the enemy's barb wire. On dark nights pulling on the string may lead the enemy to fire.
45.—Use decoys.
Decoys may be arranged in trees or stuck up momentarily over the parapet. They will draw the enemy's fire.
46.—Pretend a fire attack.
If the enemy's trenches are near enough for the sound to carry, whistles may be blown all along the line before a volley. They may be blown again after the command to omit the volley. The enemy may continue to fire indefinitely.
47.—Watch out for enemy's ruses.
Let the aim of all these devices be to make the enemy waste ammunition and to save your own. On the other hand, the enemy is likely to attempt like ruses and many others which are not permissible such as the use of white flags or raising hands to indicate pretended surrender.
48.—His use of blank cartridges.