“Now silently the host of Rohan moved forward into the field of Gondor, pouring in slowly but steadily, like the rising tide through breaches in a dike that men have thought secure. But the mind and will of the Black Captain were bent wholly on the falling city, and as yet no tidings came to him warning that his designs held any flaw.
After a while the king led his men away somewhat eastward, to come between the fires of the siege and the outer fields. Still they were unchallenged, and still Théoden gave no signal. At last he halted once again.
The City was now nearer. A smell of burning was in the air and a very shadow of death. The horses were uneasy. But the king sat upon Snowmane, motionless, gazing upon the agony of Minas Tirith, as if stricken suddenly by anguish, or by dread. He seemed to shrink down, cowed by age.
Merry himself felt as if a great weight of horror and doubt had settled on him. His heart beat slowly. Time seemed poised in uncertainty. They were too late! Too late was worse than never! Perhaps Théoden would quail, bow his old head, turn, slink away to hide in the hills.
Then suddenly Merry felt it at last, beyond doubt: a change. Wind was in his face! Light was glimmering. Far, far away, in the South the clouds could be dimly seen as remote grey shapes, rolling up, drifting: morning lay beyond them.
But at that same moment there was a flash, as if lightning had sprung from the earth beneath the City. For a searing second it stood dazzling far off in black and white, its topmost tower like a glittering needle: and then as the darkness closed again there came rolling over the fields a great boom.
At that sound the bent shape of the king sprang suddenly erect. Tall and proud he seemed again; and rising in his stirrups he cried in a loud voice, more clear than any there had ever heard a mortal man achieve before:
Arise, arise, Riders of Théoden!
Fell deeds awake: fire and slaughter!
spear shall be shaken, shield be splintered,
a sword-day, a red day, ere the sun rises!
Ride now, ride now! Ride to Gondor!
With that he seized a great horn from Guthláf his banner-bearer, and he blew such a blast upon it that it burst asunder. And straightway all the horns in the host were lifted up in music, and the blowing of the horns of Rohan in that hour was like a storm upon the plain and a thunder in the mountains.
Ride now, ride now! Ride to Gondor!
Suddenly the king cried to Snowmane and the horse sprang away. Behind him his banner blew in the wind, white horse upon a field of green, but he outpaced it. After him thundered the knights of his house, but he was ever before them. Éomer rode there, the white horsetail on his helm floating in his speed, and the front of the first éored roared like a breaker foaming to the shore, but Théoden could not be overtaken.
Fey he seemed, or the battle-fury of his fathers ran like new fire in his veins, and he was borne up on Snowmane like a god of old, even as Oromë the Great in the battle of the Valar when the world was young. His golden shield was uncovered, and lo! it shone like an image of the Sun, and the grass flamed into green about the white feet of his steed.
For morning came, morning and a wind from the sea; and the darkness was removed, and the hosts of Mordor wailed, and terror took them, and they fled, and died, and the hoofs of wrath rode over them. And then all the host of Rohan burst into song, and they sang as they slew, for the joy of battle was on them, and the sound of their singing that was fair and terrible came even to the City.”
J.R.R. Tolkien, from “the Return of the King“, 1955