'Fortified City' in the Bible

and you shall defeat every fortified city, every choice city, and you shall fell every good tree. All of the springs of water you shall stop up, and every tract of good land you shall ruin with the stones."

"Now, when this letter comes to you and your master's sons [are] with you, the chariots [are] with you, the horses, a fortified city, and weapons,

The {Israelites} secretly did things which [were] not right, against Yahweh their God; they built high places for themselves in all their towns, from the watchtower up to the fortified city.

He attacked [the] Philistines up to Gaza and its territory from the watchtower up to the fortified city.