After breakfast I took a walk on the walls of Jerusalem. The original walls of Jerusalem are, of course ancient, as old and older than David. But, the ones I was walking on were built by King Suleyman in the 15th century. There is a psalm about the walls of Jerusalem, Psalm 48:12-14, "Walk abot Zion, go arond her, count her towers, consider well her ramparts, view her citadels, that you may tell of them to the next generation. For this God is our God for ever and ever; he will be our guide even to the end."
Here is a dictionary definition of "rampart":
1.Fortification. a.a broad elevation or mound of earth raised as a fortification around a place and usually capped with a stone or earth parapet. b.such an elevation together with the parapet.2.anything serving as a bulwark or defense.
What a God we serve who is our rampart, our fortification, "our refuge and our strength" (Psalm 46).