Final answer:
Trench warfare was used to protect soldiers from enemy fire.
Step-by-step explanation:
Trench warfare was a military tactic used during World War 1 to protect soldiers from enemy fire. It involved digging deep trenches in the ground and occupying them for long periods of time. These trenches provided cover and shelter for soldiers, reducing their exposure to enemy attacks and gunfire.
Learn more about Trench warfare in World War 1