Another term used to describe infantry.Widely used during world war 1 as based on the war film The Lost Batallion
Sgt.Random:If you hear something whisles from the notch,get on the ground.
the next day...
Pvt.Loco:sir,look,we've just lost 26 men from german artilery!
Sgt.Random:Those gravel-agitated bastards,I told them to get on the ground!