During World War I, trenches were for the most part located directly in front of the enemy's projected line of attack. Where possible, trenches were also located to the sides of enemy positions; however, many trenches (such as those used for supply- and communication-purposes) extended backwards from the front lines.
for look the position is used the photography and some time bombs
Trenches were dug to protect the soldiers from enemy bullets.
The soldiers would hide in the trenches and fire at the enemy.
soldiers dug the trenches as a way to stay protected from enemy artillery.
by going down when the enemy try to kill you
Chlorine gas was used to drive enemy men out of their trenches in order to make it easier to take the enemy trenches. Even now, it is used to soften up enemy positions.
The phrase 'going over the top' - referred to the soldiers in the trenches climbing out and up to flat ground, and advancing towards the enemy over 'no-mans land'. Attacking the enemy's trenches~APEX
they wrote letters to their family or friends. they shoot at the enemy, adn hid when the enemy was shooting, The sleping ares were further back in the trenches. soldiers had trenchfeet and they got sick from the contamined trenches.
to protect soilders. from enemy shells and mortars but also a place to watch the enemy
to prevent the enemies from entruding the trenches and it could help the gunners get an accurate view of the enemy
Basically, to shelter troops from enemy attack.
They hide and shoot from them and if they get aggravated by the enemy they can charge them.