'Rampart' in the Bible

They came and besieged him in Abel of Beth Maacah, and they cast up a mound against the city, and it stood against the rampart; and all the people who were with Joab battered the wall, to throw it down.

Yahweh also spoke of Jezebel, saying, "The dogs shall eat Jezebel by the rampart of Jezreel.

He will cover you with his feathers. Under his wings you will take refuge. His faithfulness is your shield and rampart.

Yahweh has purposed to destroy the wall of the daughter of Zion; He has stretched out the line, he has not withdrawn his hand from destroying; He has made the rampart and wall to lament; they languish together.

Are you better than No-Amon, who was situated among the rivers, who had the waters around her; whose rampart was the sea, and her wall was of the sea?