If we were not perfectly convinced that Hamlet’s Father died before the play began, there would be nothing more remarkable in his taking a stroll at night, in an easterly wind, upon his own ramparts, than there would be in any other middle-aged gentleman rashly turning out after dark in a breezy spot—say Saint Paul’s Churchyard for instance— literally to astonish his son’s weak mind.
There are no more uses of "rampart" in the book.
Show samples from other sources
they stormed the ramparts of the city
The invaders were unable to penetrate the outer ramparts.