'Fortress' in the Bible

David captured the fortress of Zion, the city of David.

David occupied the fortress and called it the city of David. And David built all around [it] from the Millo and {inward}.

And he said: "Yahweh [is] my rock, my fortress, and my deliverer.

and came to the fortress of Tyre and all the cities of the Hivites and the Canaanites. Then they went out to the Negev of Judah at Beersheba.