Adam Clarke on 2 Kings 15:3

He did that which was right - It is said, 2Chr 26:5, that he sought the Lord in the days of Zechariah the prophet, and God made him to prosper; that he fought against the Philistines; broke down the walls of Gath, Jabneh, and Ashdod; prevailed over the Arabians and Mehunims; and that the Ammonites paid him tribute; and his dominion extended abroad, even to the entering in of Egypt; that he built towers in Jerusalem, at the corner gate, valley gate, and turning of the wall; and built towers also in the desert, and digged many wells; that he had a very strong and well-regulated military force, which he provided with a well-stocked arsenal; and constructed many military engines to shoot arrows and project great stones; and that his fame was universally spread abroad.