This is not a frontline Trench, this is a trench that is to the rear of the frontline, either a supervision or communication trench, these men are preparing to move forward into the frontline trench, they have fixed baonettes, and they would be preparing themselves with last minute checks of their equipment, ammo states, rations and section stores etc. a Frontline trench is wider and is fortified either with a zig zag formation or dug in squares , so their is no feild of fire down a straight line trench such as the one these men are in, also it has fire steps,so men can take up fire positions in case of a surprise assault by the enemy, and these men a relaxing and milling prior to hoving their instincts for battle, a front linr trench is less crowded and more formal.