'Fortified' in the Bible

Today, I am the One who has made you a fortified city, an iron pillar, and bronze walls against the whole land—against the kings of Judah, its officials, its priests, and the population.

Declare in Judah, proclaim in Jerusalem, and say:Blow the ram’s horn throughout the land.Cry out loudly and say:Assemble yourselves,and let’s flee to the fortified cities.

They will consume your harvest and your food.They will consume your sons and your daughters.They will consume your flocks and your herds.They will consume your vines and your fig trees.They will destroy with the swordyour fortified cities in which you trust.

Why are we just sitting here?Gather together; let us enter the fortified citiesand perish there,for the Lord our God has destroyed us.He has given us poisoned water to drink,because we have sinned against the Lord.

while the king of Babylon’s army was attacking Jerusalem and all of Judah’s remaining cities—against Lachish and Azekah, for they were the only ones left of Judah’s fortified cities.