Frederick Palmer,
My Second Year of the War
“ The lifting of the barrage as the infantry went in was signaled to the eye when the canopy of shell-smoke began to grow thin and gossamery for want of fresh bursts and another was forming beyond, as if the master hand at such things had lifted a long trail of cloud from one set of crests to another; only, nature never does things with such mathematical precision. All in due order to keep its turn in the program the German artillery began to reply according to its system of distribution, with guns and ammunition plentiful but inferior in quantity to the French. ”
