2 Chronicles 32:2-5

2And when Hezekiah saw that Sennacherib was come, and that he was minded to fight against Jerusalem,

3he took counsel with his princes and his mighty men to stop the fountains of waters that were outside the city; and they helped him.

4And there was gathered together much people, and they stopped all the fountains, and the torrent that flows through the midst of the land, saying, Why should the kings of Assyria come and find much water?

5And he strengthened himself, and built up all the wall that was broken down, and raised it up to the towers, and [built] another wall outside, and fortified the Millo of the city of David, and made darts and shields in abundance.