'Fortify' in the Bible

He spoke before his brothers and the army of Samaria, and said, "What are these feeble Jews doing? Will they fortify themselves? Will they sacrifice? Will they finish in a day? Will they revive the stones out of the heaps of rubbish, since they are burned?"

You numbered the houses of Jerusalem, and you broke down the houses to fortify the wall.

Though Babylon should mount up to the sky, and though she should fortify the height of her strength, yet from me shall destroyers come to her, says Yahweh.

He who dashes in pieces has come up against you. Keep the fortress! Watch the way! Strengthen your waist! Fortify your power mightily!