 Construction was begun in 1603 or October 1609 under military architect Gabrio Brusca, and was substantially complete within three years.Ancillary fortified structures were the tower of Sorico, the Torretta del Passo, the Fortino d'Adda, the Torrino di Borgofrancone, the Torretta di Curcio and the tower of Fontanedo.Like the city of Milan, the fort of Fuentes yielded in 1706 to Prince Eugène of Savoy, ending Spanish control of the area.