2 Chronicles 32:2-6

When Hezekiah realized that Sennacherib’s strategy was to take Jerusalem, he talked to his advisors and military leaders about eliminating all the water supplies outside the city; they thought it was a good idea. There was a great turnout of people to plug the springs and tear down the aqueduct. They said, “Why should the kings of Assyria march in and be furnished with running water?” Hezekiah also went to work repairing every part of the city wall that was damaged, built defensive towers on it, built another wall of defense further out, and reinforced the defensive rampart (the Millo) of the old City of David. He also built up a large store of armaments—spears and shields. He then appointed military officers to be responsible for the people and got them all together at the public square in front of the city gate.