Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Paris, Banks of the Seine' has mentioned 'Fortress' in the following places:

Occurrence Sentence	Text Source
In the late 12th century, Philip Augustus extended the Louvre fortress to defend the city against river invasions from the west, gave the city its first walls between 1190 and 1215, rebuilt its bridges to either side of its central island, and paved its main thoroughfares.	WIKI