Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Historic Fortified Town of Campeche' has mentioned 'Fortification' in the following places:
Occurrence Sentence Text Source
Founded in 1540 by Francisco Montejo, Campeche was terrorized by pirates and marauders until the city started fortification in 1686.
This military defensive system for mid-17th century was inadequate and poorly strategic so a new fortification, hexagonal wall, integrating eight bastions, four doors and walls, was authorized, with construction started in 1686 and concluding in 1704.