'Rampart' in the Bible

So Joab's men came and laid siege against him in Abel of Beth Maacah. They prepared a siege ramp outside the city which stood against its outer rampart. As all of Joab's soldiers were trying to break through the wall so that it would collapse,

At that time this song will be sung in the land of Judah: "We have a strong city! The Lord's deliverance, like walls and a rampart, makes it secure.

The watchmen of Nineveh shout: "An enemy who will scatter you is marching out to attack you!" "Guard the rampart! Watch the road! Prepare yourselves for battle! Muster your mighty strength!"

You are no more secure than Thebes -- she was located on the banks of the Nile; the waters surrounded her, her rampart was the sea, the water was her wall.