'Stronghold' in the Bible

The inhabitants of Jebus said to David, “You shall not enter here.” Nevertheless David captured the stronghold of Zion (that is, the city of David).

Then David dwelt in the stronghold; therefore it was called the city of David.

David was then in the stronghold, while the garrison of the Philistines was then in Bethlehem.

From the Gadites there came over to David in the stronghold in the wilderness, mighty men of valor, men trained for war, who could handle shield and spear, and whose faces were like the faces of lions, and they were as swift as the gazelles on the mountains.

Then some of the sons of Benjamin and Judah came to the stronghold to David.