When crossing the battlefield at the start of the level, dig down through the dirt after the fourth skull and crossbones sign. Avoid the pipe emissions to dig to the lower level, then dig left through the dirt to find this hidden item.
"French army trench shovel. The shovel was too short to be of any real use digging trenches or tunnels.
However French soldiers' sharpened the tool's blade to turn it into a weapon more effective than a bayonet."