There were hardly any bullets flying during WWI though. It was just people waiting to shoot at anyone who'd come out of the trenches.
Since nobody came out of the trenches unless they were messengers or medics, hardly any bullets flew.
Unless someone would be stupid enough to go out into No Man's Land, they'd be generally alive.
But in a video game where people value their lives like they value the dead skin on their arm, the trenches are just a spawning area. They go flooding out into the trenches to be mowed down by machine guns.
Freaking excellent.