'Fortification' in the Bible

Rehoboam continued to live in Jerusalem and built defensive fortification cities throughout Judah,

Then the hordes of all the nations that fight against Aruel, all that attack her and her fortification and besiege her, will become like a dream, with its visions in the night

and boasting, "I'm going to invade a land comprised of open country that is at rest, its people living confidently, all of whose inhabitants will be living securely, with neither fortification nor bars on their doors.

"Tyre built itself a fortification, hoarding silver like dust and pure gold like mud in a street.