Read the dictionary definition of bulwark. All definitions for this word.
1. a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away
2. a fencelike structure around a deck (usually plural)
3. an embankment built around a space for defensive purposes
1. they stormed the ramparts of the city
2. they blew the trumpet and the walls came tumbling down
4. defend with a bulwark