Call-to-Arms of the Rohirrim is what Théoden chants after Gandalf has healed him of Saruman's influence and Éomer has offered him his sword, Gúthwinë. Théoden chants it in the language of the Rohirrim and his guards come running, thinking that he has called them.
Arise now, arise, Riders of Théoden!
Dire deeds awake, dark is it eastward.
Let horse be bridled, horn be sounded!
- Forth Eorlingas!