This fort was built in the 18th century based on the original design by military engineer Agustín Crame, with modifications by engineer Juan José de León. It covers an area of 1,828.79 square meters and was completed on August 9, 1792. It was abandoned at the end of the 19th century, and on February 9, 1995, one of the rooms in the fort was opened to the public to display a model of this walled enclosure along with portraits of some of the pirates who attacked the square during the viceregal period.