'Watchmen's' in the Bible

And he took him to the watchmen's field, to the top of Pisgah, and built seven altars, and offered up a bullock and a ram on each altar.

And the children of Israel did secretly against Jehovah their God things that were not right; and they built them high places in all their cities, from the watchmen's tower to the fortified city.

He smote the Philistines unto Gazah and its borders, from the watchmen's tower to the fortified city.