2 Chronicles 32:5

Also he strengthened himself, was filled with new energy and enterprise, and built up all the wall that was broken, apparently since the time of Joash, king of Israel, 2 Chronicles 25:23, and raised it up to the towers, providing the wall with special towers for defense, and another wall without, he repaired the wall enclosing the lower city, and repaired Millo in the City of David, the castle of the upper city, and made darts, missiles of defense, and shields in abundance, he prepared very carefully for a siege.