'Strongholds' in the Bible

O thou daughter that dwellest in Dibon, come down from thy glory, and sit in thirst; for the destroyer of Moab is come up against thee, he hath destroyed thy 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 hath failed; they are become as women: her dwelling-places are set on fire; her bars are broken.