A SECTION OF A FORWARD ENTRENCHED ZONE
OTHERS ARE IN REAR" />
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.) During an engagement, troops by using these trenches can go safely to the help of the troops in the fire trenches. They are usually deep and narrow.
(5) Intermediate Trenches. They are constructed in rear of the support trenches when the ground renders it possible to offer a stubborn resistance between the support and the reserve trenches. They are constructed like fire trenches.
(6) Reserve Trenches. Constructed like the fire trenches and occupied by the local reserves who live in deep dug-outs. The intermediate and reserve trenches are often merged into the support trenches. All are protected by barbwire entanglements. No set plan of trenches can be used. The topographical features of the ground must govern.
MILITARY MAPS
Definition. "A military map is a drawing made to represent some section of the country, showing the features that are of military importance, such as roads, bridges, streams, houses, and hills. The map must be so drawn that you can tell the distance between any two points, the heights of the hills, and the relative positions of everything shown." (Field Service Regulations.)
In the field the military maps are supplemented by sketches, or field maps, prepared from day to day. For facility in reading, military maps are made according to a uniform system of scales and contour intervals as follows:
Road Sketches. Three inches on the map is equal to 1 mile on the ground, contour intervals of 20 feet.