2 Chronicles 33:14

After this he built a wall without the city of David He repaired and strengthened that wall which Hezekiah had built, (2 Chronicles 32:5,) and which, possibly, the king of Assyria, or of Babylon rather, when he last took Jerusalem, had caused to be thrown down, either wholly or in part. On the west side of Gihon On the west side of the city of David, to which Hezekiah had brought the watercourse down, mentioned 2 Chronicles 32:30, into the great pool which he had made to receive it: and possibly this wall was built to secure the free use of it to the citizens, when they should be distressed or besieged by an enemy.