'Fortress' in the Bible

And the inhabitants of Jebus say to David, 'Thou dost not come in hither;' and David captureth the fortress of Zion -- it is the city of David.

And David dwelleth in the fortress, therefore they have called it, 'City of David;'

and David is then in the fortress, and the station of the Philistines is then in Beth-Lehem,

And of the Gadite there have been separated unto David, to the fortress, to the wilderness, mighty of valour, men of the host for battle, setting in array target and buckler, and their faces the face of the lion, and as roes on the mountains for speed: