'Fortified Cities' in the Bible

So Joshua and the Israelites finished inflicting a terrible slaughter on them until they were destroyed, although a few survivors ran away to the fortified cities.

Now give me this hill country the Lord promised me on that day, because you heard then that the Anakim are there, as well as large fortified cities. Perhaps the Lord will be with me and I will drive them out as the Lord promised.”

The fortified cities were Ziddim, Zer, Hammath, Rakkath, Chinnereth,