Occurrence of Attributes in Original Text

The text related to the cultural heritage 'City of Graz – Historic Centre and Schloss Eggenberg' has mentioned 'Fortress' in the following places:
Occurrence Sentence Text Source
During this attack, the commanding officer in the fortress was ordered to defend it with about 900 men against Napoleon's army of about 3,000.
The Castle hill (German: Schlossberg), a hill dominating the historic centre (475xc2xa0m (1,558.40xc2xa0ft) high), site of a demolished fortress, with views over Graz.
Riegersburg Castle, a mighty fortress that was never taken.