The rampart loomed suddenly before them, a high shadow beyond a dark pit.
It looked like a great rampart or sea-wall whose foundations had shifted, so that its courses were all twisted and disordered, leaving great fissures and long slanting edges that were in places almost as wide as stairs.
Far off a horn blew on the ramparts of the Morannon.
Across the mouth of the pass, from cliff to cliff, the Dark Lord had built a rampart of stone.
’Not far ahead now lies Helm’s Dike, an ancient trench and rampart scored across the coomb, two furlongs below Helm’s Gate.
There are no more uses of "rampart" in the book.
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they stormed the ramparts of the city
The invaders were unable to penetrate the outer ramparts.