“When the darkness is not so great and the powers of sight more nearly approach in value the powers of hearing, it is better to place the sentinel on low ground, with the sky line to his front. This is because approaching persons will be silhouetted on the sky line and that it is difficult to see when looking down from a height into a dark valley.
“The night post should always be provided with an obstacle placed from 10 to 30 yards to the front of the sentinel. It must be low, so that it will not be seen by an approaching enemy. Its value is increased if a wire or rope is attached to some object that will fall down with a loud noise when anyone trips over the obstacle.”
Procedure
The class is now conducted to the place where the sentinel post is to be established.
The Director: “Lieutenant Barry, where would you locate your sentinel post?”
Lieutenant Barry: “I would locate it at ——”
(Note.—The location of the sentinel post should be determined upon after careful consideration of all the factors that enter into the problem.)
The Director now distributes the sheets containing Situation No. 5.
The Problem
Situation No. 5: