'Fortify' in the Bible

And he spake before his brethren and the army of Samaria, and said, What are these feeble Jews doing? will they fortify themselves? will they sacrifice? will they make an end in a day? will they revive the stones out of the heaps of rubbish, seeing they are burned?

and ye numbered the houses of Jerusalem, and ye brake down the houses to fortify the wall;

Though Babylon should mount up to heaven, and though she should fortify the height of her strength, yet from me shall destroyers come unto her, saith Jehovah.

He that dasheth in pieces is come up against thee: keep the fortress, watch the way, make thy loins strong, fortify thy power mightily.