It is a shallow trench with a parapet at least three feet
thick and one foot high. It furnishes cover against rifle fire, but
scarcely any against shrapnel.
(2) Fire Trench. It should be deep and narrow with the parapet flat
and concealed. While in it, the troops fire at the enemy; hence the name
fire trench.
Usual forms of fire trenches are as shown in the following illustration:
[Illustration]
(3) Support Trenches. The supports sleep and live in these trenches;
hence they are covered. The cover (roof) must be thick enough to afford
protection from high angle artillery fire. It is placed as near the fire
trench as possible.
(4) Approach Trenches. These connect fire trenches with the support
trenches and the support trenches with any trenches in rear where
natural covered communication is impracticable.
[Illustration: CROSS SECTION OF A SUPPORT TRENCH AND DUGOUT]
[Illustration: A SECTION OF A FORWARD ENTRENCHED ZONE
OTHERS ARE IN REAR]
They are zig-zagged to escape being enfiladed. (That is, to prevent one
explosion from doing too much damage in a single trench.
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