'Strongholds' in the Bible

You daughter who dwells in Dibon, come down from your glory, and sit in thirst; for the destroyer of Moab has come up against you, he has destroyed your strongholds.

Kerioth is taken, and the strongholds are seized, and the heart of the mighty men of Moab at that day shall be as the heart of a woman in her pangs.

The mighty men of Babylon have forborne to fight, they remain in their strongholds; their might has failed; they are become as women: her dwelling places are set on fire; her bars are broken.