What does 2 Chronicles 33:14 mean?

After that, Manasseh rebuilt the outer wall of the city of David, west of Gihon in the valley, all the way to the Fish Gate and around the hill of Ophel. He made it much higher. He also put military commanders in all the fortified cities of Judah. 2 Chronicles 33:14 - Modern Text Bible

(Manasseh took steps to strengthen Jerusalem and the nation’s defenses after his return.)