Quote from : The Lord of the Rings: The Return of the King Movie

Gandalf: [During the siege of Gondor] Peregrin Took! Go back to the Citadel!
Pippin: [dazed] They called us out to fight.
Gandalf: This is no place for a Hobbit!
[He lays about him with his sword and staff; an Orc rushes up behind him and Pippin kills it. Gandalf looks at Pippin]
Gandalf: [impressed] Guard of the Citadel indeed!