'Watchmen' in the Bible

Then all the people of the land went to the house of Baal and tore it down. They utterly smashed his altar and his images to pieces, and they put Mattan the priest of Baal to death in front of the altars. And [Jehoiada] the priest appointed officers over the house of the Lord.

And the children of Israel did secretly those things that were not right against the LORD their God, and they built them high places in all their cities, from the tower of the watchmen to the fenced city.

He smote the Philistines, even unto Gaza, and the borders thereof, from the tower of the watchmen to the fenced city.