'Rampart' in the Bible

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.