'Fortified' in the Bible

So David said to Abishai, “Sheba son of Bichri will do more harm to us than Absalom. Take your lord’s soldiers and pursue him, or he will find fortified cities and elude us.”

This is what he said: LORD, you are my stone stronghold and my fortified place; you are continuously delivering me.

and arrived at the fortified city of Tyre and all of the towns of the Hivites and Canaanites.