'Fortified' in the Bible

"As for me, today I'm making you a fortified city, an iron pillar, and a bronze wall against the whole land against the kings of Judah, against its princes, against its priests, and against the people of the land.

Declare in Judah, make known in Jerusalem, by saying, "Blow the trumpet in the land, cry out, and say, "Gather together and let's go to the fortified cities!'

"They'll devour your harvest and your food. They'll devour your sons and your daughters. They'll devour your vines and your fig trees. With their swords they'll batter down your fortified cities in which you trust.

Why are we sitting here? Join together! Let's go to the fortified cities and perish there! For the LORD our God has condemned us to perish and given us poisoned water to drink, because we have sinned against him.

I'll make you a fortified wall of bronze to this people. They'll fight against you, but they won't prevail against you, for I am with you to save you and deliver you,"

while the army of the king of Babylon was fighting against Jerusalem and all the cities of Judah that were left, namely Lachish and Azekah. (They were the only fortified cities that remained among the cities of Judah.)