'Strongholds' in the Bible

“Come down from your glory,O Daughter living in Dibon,And sit on the parched ground [among the thirsty]!For the destroyer of Moab has advanced against you;He has destroyed your strongholds.

“Kerioth [and the cities] has been takenAnd the strongholds seized;And the hearts of the warriors of Moab in that dayShall be like the heart of a woman in childbirth.