rampart has definitions from the field of military
[ noun ] (military) an embankment built around a space for defensive purposes


wall bulwark


"they stormed the ramparts of the city" "they blew the trumpet and the walls came tumbling down"

Used in print

(Bruce Palmer, "My Brother's Keeper", Many Are...)

He had peered through the darkness at the rampart .

He turned slowly and began to crawl back up the bank toward the rampart .