'Fortresses' in the Bible

Therefore thus says the Lord Yahweh: "An adversary will overrun the land; and he will pull down your strongholds, and your fortresses will be plundered."

"The Lord Yahweh has sworn by himself," says Yahweh, the God of Armies: "I abhor the pride of Jacob, and detest his fortresses. Therefore I will deliver up the city with all that is in it.