trench
A trench is a facility that defends an enemy's attack in the field, usually referred to as digging the ground. By setting up trenches, soldiers can reduce exposure to enemy gun bombardment, make guns easier to mount and fire, and securely access other trenches, rear, or telecommunications facilities. Generally, it is used to dig the ground so that it can enter from 1 to 3 accent, and to protect the surroundings with dirt that has been dug. If time and resources are sufficient, they may be reinforced with wood, concrete, or steel plates. Soil and ground soils on the surface are usually colored because they can be observed from a distance, so they are camouflaged. The attacker in the trench warfare deals with the already protected enemy in the exposed state, and the damage is serious.