The Return of the King
Busy as ants hurrying orcs were digging, digging lines of deep trenches in a huge ring, just out of bowshot from the walls; and as the trenches were made each was filled with fire, though how it was kindled or fed, by art or devilry, none could see. All day the labour went forward, while the men of Minas Tirith looked on, unable to hinder it. And as each length of trench was completed, they could see great wains approaching; and soon yet more companies of the enemy were swiftly setting up, each behind the cover of a trench, great engines for the casting of missiles. There were none upon the City walls large enough to reach so far or to stay the work.
At first men laughed and did not greatly fear such devices. For the main wall of the City was of great height and marvellous thickness, […], hard and dark and smooth, unconquerable by steel or fire, unbreakable except by some convulsion that would rend the very earth on which it stood. (5.4.139-40)
"To me! To me!" cried Théoden. "Up Eorlingas! Fear no darkness!" But Snowmane wild with terror stood up on high, fighting with the air, and then with a great scream he crashed upon his side: a black dart had pierced him. The king fell beneath him.
The great shadow descended like a falling cloud. And behold! it was a winged creature: if bird, then greater than all other birds, and it was naked, and neither quill nor feather did it bear, and its vast pinions were as webs of hide between horned fingers; and it stank. A creature of an older world maybe it was, whose kind, lingering in forgotten mountains cold beneath the Moon, outstayed their day, and in hideous eyrie brid this last untimely brood, apt to evil [...] (5.6.5-6)
But Théoden was not utterly forsaken. The knights of his house lay slain about him, or else mastered by the madness of their steeds were borne far away. Yet one stood there still: Dernhelm the young, faithful beyond fear; […] Merry crawled on all fours like a dazed beast, and such a horror was on him that he was blind and sick.
"King's man! King's man!" his heart cried within him. "You must stay by him. As a father you shall be to me, you said." But his will made no answer, and his body shook. He dared not open his eyes or look up." (5.6.8-9)