'Stronghold' in the Bible

"And you, son of man, [will it] not [be that] on the day {when I take from them} their stronghold, the joy of their glory, the delight of their eyes, and the longing of their inner self, their sons and daughters--

I will pour out my rage over Sin, the stronghold of Egypt, and I will cut off the crowd of No.

"Thus you must say to them, 'Thus says the Lord Yahweh: "{As I live}, {surely} whoever [is] in the ruins, by the sword they will fall, and whoever [is] on the surface of the open field, I will give him to the animals to eat him, and whoever [is] in the stronghold and in the cave, they will die by the plague.