'Fortifications' in the Bible

How is the land in which they live, is it good or bad? And how are the cities in which they live, are they like open camps or with fortifications?

The unassailable fortifications of your walls He will bring down,Lay low and cast to the ground, even to the dust.

“I will also cut off the cities of your landAnd tear down all your fortifications.

All your fortifications are fig trees with ripe fruit—When shaken, they fall into the eater’s mouth.

Draw for yourself water for the siege!Strengthen your fortifications!Go into the clay and tread the mortar!Take hold of the brick mold!