The fort, accessible from the Champ de Mars, was envisaged by Vauban as early as 1692 to occupy a flat area of land that dangerously dominated the town. Its construction, from 1709 onwards, was guided by the plans drawn up during his lifetime. The fort was extended between 1845 and 1850.
In his first project, Vauban proposed the creation of a redoubt with machicolations on the Poët mountain. The work was intended to prevent the enemy from seizing this position, which had an important command over the town and the castle. It is highly likely that Vauban took up a proposal from the engineer Delabat, dating from January 1692. In February 1704, he complained that the work had not yet begun. It was not until 1709, two years after Vauban's death, that work began under the...