From The Two Towers, “The King of the Golden Hall”
Théoden chanted this in the tongue of Rohan a call to arms when Hama gave him his sword after Gandalf brought him back from old age.

Arise now, arise, Riders of Théoden!
Dire deeds awake, dark is it eastward.
Let horse be bridled, horn be sounded!
Forth Eorlingas!

Provided by: NenyaGold