At the beginning of 1500s, the Muslim Sultanate of Gujarat was the principal seapower in India. Gujarat fought the Portuguese fleets in collaboration with the Mamluks. The Portuguese were defeated by a combined Mamluk-Gujarati fleet in 1508, which was in turn destroyed by a Portuguese fleet in the Battle of Diu (1509). By 1536, the Portuguese had gained complete control of Diu, while Gujarat was under attack from the Mughals.