'Stronghold' in the Bible

Be thou ashamed, O Sidon; for the sea hath spoken, the stronghold of the sea, saying, I have not travailed, nor brought forth, neither have I nourished young men, nor brought up virgins.

Howl, ye ships of Tarshish; for your stronghold is laid waste.

For thou hast been a stronghold to the poor, a stronghold to the needy in his distress, a refuge from the storm, a shade from the heat, when the blast of the terrible ones is as a storm against the wall.

And the multitude of all the nations that fight against Ariel, even all that fight against her and her stronghold, and that distress her, shall be as a dream, a vision of the night.