'Watchmen' in the Bible

And when Herod was about to take him out, the same night Peter was sleeping in chains between two armed men, and the watchmen were keeping watch before the door of the prison.

And when they had gone past the first and second watchmen they came to the iron door into the town, which came open by itself: and they went out and down one street; and then the angel went away.

And Herod, when he sent for him, and he was not there, after questioning the watchmen, gave orders that they were to be put to death. Then he went down from Judaea to Caesarea for a time.