King Théoden had some great lines in LotR and made the best speeches, but the line above i always attributed to a friend Tolkien knew and served with in the trenches of the Somme. Four were from his schooldays in Birmingham where he formed a club ( the Tea Club ) and two were killed in action. When he put those words in the King's dialogue with Aragorn i hear an echo of his conversations with them during the short time he served in the Lancashire Fusiliers as an officer before succumbing to trench fever.
The line; "Fell deeds awake. Now for wrath. Now for ruin. And the red dawn!" is pure Tolkien, drawing upon his years of studying Beowulf and Anglo-Saxon lore at Oxford.
Watched a film with Costner and Clint in it where Costner ( escaped from prison) is in a field. Clint asked one if his officers if the prisoner is surrounded. Officer says “tighter then a frog’s pu55y and that is water tight.