Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Syracuse and the Rocky Necropolis of Pantalica' has mentioned 'Fortress' in the following places:
Occurrence Sentence Text Source
After the end of the conflict Dionysius built a massive fortress on Ortygia and 22xc2xa0km-long walls around all of Syracuse.
A small party of Roman soldiers approached the city under the cover of night and managed to scale the walls to get into the outer city and with reinforcements soon took control, killing Archimedes in the process, but the main fortress remained firm.