'Fortified Cities' in the Bible

Now it came to pass in the fourteenth year of king Hezekiah, that Sennacherib king of Assyria came up against all the fortified cities of Judah, and took them.

Hast thou not heard how I have done it long ago, and formed it of ancient times? now have I brought it to pass, that it should be thine to lay waste fortified cities into ruinous heaps.