In 1567, Inaba Ittetsu along with Andō Michitari and Ujiie Bokuzen, agreed to join the forces of Oda Nobunaga. Eventually, they mounted a victorious final attack at the Siege of Inabayama Castle. After taking possession of the castle, Nobunaga changed the name of both Inabayama Castle and the surrounding town to Gifu. Nobunaga revealed his ambition to conquer the whole of Japan. In about two weeks' time Nobunaga had entered the sprawling Mino Province, raised an army, and conquered the ruling clan in their mountaintop castle. Following the battle the Mino Triumvirate, awed by the speed and skill of Nobunaga's conquest, permanently allied themselves to Nobunaga.