Arrows thick as the rain came whistling over the battlements, and fell clinking and glancing on the stones. Some found a mark. The assault on Helm’s Deep had begun, but no sound or challenge was heard within; no answering arrows came.
The assailing hosts halted, foiled by the silent menace of rock and wall. Ever and again the lightning tore aside the darkness. Then the Orcs screamed, waving spear and sword, and shooting a cloud of arrows at any that stood revealed upon the battlements; and the men of the Mark amazed looked out as it seemed to them, upon a great field of dark corn, tossed by a tempest of war, and every ear glinted with barbed light.
—J.R.R. Tolkien, The Lord of the Rings