'Fortified City' in the Bible

For You have made a city into a heap [of trash],A fortified city into a ruin;A palace of foreigners is no longer a city,It will never be rebuilt.

For the fortified city is isolated,A settlement deserted and abandoned like the desert;There the calf will graze,And there it will lie down and feed on its branches.

So the Rabshakeh returned and found the king of Assyria fighting against Libnah [a fortified city of Judah], for he had heard that the king had left Lachish.