'Fortified Cities' in the Bible

Now it happened in the fourteenth year of king Hezekiah, that Sennacherib king of Assyria attacked all of the fortified cities of Judah, and captured them.

Have you not heard how I have done it long ago, and formed it in ancient times? Now I have brought it to pass, that it should be yours to destroy fortified cities, turning them into ruinous heaps.