The Night Patrol
"Investigate the enemy frontline"
British soldiers waiting for nightfall in their trenches.
This is where the soldiers patrolled. Since there is nothing to hide them one step in there at day time would get them killed.
Searchlights used to find enemy patrollers.
The patrollers were armed with knives and riffles to be able to kill the enemy or capture them.
There was a huge chance to get captured or killed while the mission and once you get spotted crossing the No Man's land there was barely any chances to make it back.
Many soldiers considered returning to their trenches the most difficult bit of the patrol as the nervous allied soldiers fired at them.