How the trenches were setup?

Trenches in World War I were typically constructed in a zigzag pattern to reduce the impact of enemy fire and to provide cover for soldiers. They included a front line trench, support trench, and reserve trench, all connected by communication trenches. The front line was often reinforced with sandbags and barbed wire, while the deeper support and reserve trenches housed supplies and additional troops. This system aimed to create a defensive network that could withstand prolonged attacks.