Answer:
The Trench Warfare
Step-by-step explanation:
Trench warfare refers to a warfare in which rival armed forces launches an attack, counterattack, and defend from comparably permanent systems of trenches dug underground.
The opposing systems of trenches are usually close to each other. Trench warfare is often adopted when the superior firepower of the defense side oblige the opposing forces to dig in so widely as to sacrifice their mobility in order to gain protection.