likely became infested with malaria. The true end came in 1324, when Sardinia was entirely lost to the Aragonese. Always Ghibelline, Pisa tried to build up its power in the course of the 14th century, and even managed to defeat Florence in the Battle of Montecatini (1315), under the command of Uguccione della Faggiuola. Eventually, however, after a long siege, Pisa was occupied by Florentines in 1405. Florentines corrupted the capitano del popolo ("people's chieftain"), Giovanni Gambacorta, who at night opened the city gate of San Marco. Pisa was never conquered by an army. In 1409, Pisa was the seat of a council trying to set the question of the Great Schism. In the 15th century, access to the sea became more difficult, as the port was silting up and was cut off from the sea. When in 1494, Charles VIII of France invaded the Italian states to claim the Kingdom of Naples, Pisa reclaimed its independence as the Second Pisan Republic. The new freedom did not last long; 15 years of battles and sieges by the Florentine troops led by Antonio da Filicaja, Averardo Salviati and Niccolò Capponi were made, but they failed to conquer the city. Vitellozzo Vitelli with his brother Paolo were the only ones who actually managed to break the strong defences of Pisa and make a breach in the Stampace bastion in the southern west part of the walls, but he did not enter the city. For that, they were suspected of treachery and Paolo was put to death. However, the resources of Pisa were getting low, and at the end, the city was sold to the Visconti family from Milan and eventually to Florence again. Livorno took over the role of the main port of Tuscany. Pisa acquired a mainly cultural role spurred by the presence of the University of Pisa, created in 1343, and later reinforced by the Scuola Normale Superiore di Pisa (1810) and Sant'Anna School of Advanced Studies (1987). Pisa was the birthplace of the important early physicist Galileo Galilei. It is still the seat of an archbishopric. Besides its educational institutions, it has become a light industrial centre and a railway hub. It suffered repeated destruction during World War II. Since the early 1950s, the US Army has maintained Camp Darby just outside Pisa, which is used by many US military personnel as a base for vacations in the area.