'Fortresses' in the Bible

Then he shall turn his face toward the fortresses of his own land; but he shall stumble and fall, and shall not be found.

But in his place shall he honor the god of fortresses; and a god whom his fathers didn't know shall he honor with gold, and silver, and with precious stones, and pleasant things.

He shall deal with the strongest fortresses by the help of a foreign god: whoever acknowledges [him] he will increase with glory; and he shall cause them to rule over many, and shall divide the land for a price.