A strong hold (stronghold) speaks of a position of strength. It can be something of good or of evil. In the natural, a stronghold would be perhaps a fort or fortress, a tower, a bunker or a place of protection and safety from harm.
Numerous Old testament references speak of Israel in their sin and idolatry. They had walled cities as a natural stronghold where they would seek safety from enemy attacks. They had alliances with pagan nations for protection, another type of “stronghold” that they saw as safety. For their unrepented sinful ways, God sent enemies to attack them as chastisement for their evil ways.  The walls would be breached 

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