If it is in a city, acropolis(high city).
It is called a Redoubt.
Fortress Hill Station was created in 1985.
Brimstone Hill Fortress National Park was created in 1987.
Acro Polis
Acro Polis
Acro Polis
Hill Valley High School
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the fortress of soltitude
Brown Clee Hill at 546 meters.
A mountain?
Polis is the Greek word for a city-state, that is a tract of farmland on which was built a city and its protective fortress (acro-polis = high city, that is the fortress on a hill, around which the city came to be built). It was independent - self ruled - which is why the term city-state is used.
The attack on the walls of a fortress using ladders is an Escalade.