You don't think a pifflin' little Pip-Squeak shell could go through his head?"

He stepped up on the firing-step as he spoke, and on the instant, with a rush and crash, another "Pip-Squeak" struck the parapet immediately in front of him, blowing the top edge off it, filling the air with a volcano of mud, dirt, smoke, and shrieking splinters, and, either from the shock of the explosion or in an attempt to escape it, throwing the man off his balance on the ledge of the firing-step to sprawl full length in the mud.