Despite subsequently receiving the surrender of most of the strongholds in Campania, John did not immediately march on Naples and Ferdinand and his wife Isabella were able to hold it and slowly regain their position. Isabella appears to have been responsible for dissuading Orsini from supporting John and Genoa removed its, assistance. The papacy, Milan, and the Albanian chief Skanderbeg—who came to the aid of the prince whose father had aided him—provided forces which decisively defeated John's land forces at Troia on August 18, 1462. His fleet was finally demolished by the combined forces of Ferdinand and King Juan II of Aragon off Ischia in July 1465. By 1464, Ferdinand had re-established his authority in the kingdom, although some antipathy from the barons remained.