The trooper yielding to this invitation, he and Mr. Bagnet, not to embarrass the domestic preparations, go forth to take a turn up and down the little street, which they promenade with measured tread and folded arms, as if it were a rampart.
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.