Sentinel in example sentence
They called out and knocked loudly at the gate of the inn, which was still shut; on seeing which, Don Quixote, even there where he was, did not forget to act as sentinel, and said in a loud and imperious tone, "Knights, or squires, or whatever ye be, ye have no right to knock at the gates of this castle; for it is plain enough that they who are within are either asleep, or else are not in the habit of throwing open the fortress until the sun's rays are spread over the whole surface of the earth.