What are the defensive features of a trench?

Trenches offer several defensive features, including protection from enemy fire and shrapnel, as they are dug deep into the ground, allowing soldiers to remain covered. They provide a physical barrier that can hinder enemy movement and visibility, facilitating better defense against assaults. Additionally, trenches can be reinforced with materials such as sandbags or wooden planks to enhance their strength and durability. Finally, the zigzag design of some trench systems minimizes the impact of enemy artillery and prevents enfilade fire.