'Fortress' in the Bible

And Pekah the son of Remaliah, his captain, conspired against him, and smote him in Samaria, in the fortress of the king's house, with Argob and Arieh, and with him fifty men of the Gileadites; and he slew him, and reigned in his stead.

The Israelites said things about the Lord their God that were not right. They built high places in all their cities, from the watchtower to the fortress.

He defeated the Philistines as far as Gaza and its territory, from the watchtower to the city fortress.