Hezekiah built a second wall when the king of Assyria was planning to beseige the city of Jerusalem and extended a second wall around those that lived outside the city wall.
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Transcript
Check Your Walls
in the year of Hezekiah, king of Judah although his parents were evil he decided to do right in the eyes of the Lord and brought down all the high places and smashed the idols. Purified the temple and tried to keep the enemy away.
Ruined walls after attacks leave space for wearing down, for sickness to enter as the enemy has opportunity. ADHD example of sickness caused by walls of trauma that are down causing hypervigilence in the child.