A Total War: Shogun 2: Fall of the Samurai campaign in which I attempt to restore the Chrysanthemum Throne to its rightful place of power during the Boshin WarThe Yamauchi clan owe their lordship in Tosa to their support of Oda Nobunaga, and then, after that great warlord's death, their support of Tokugawa Ieyasu at the battle of Sekigahara in 1600. Those families who supported the newly victorious Shogun did rather well in the centuries that followed. The Tosa domain, however, was predominantly loyal to the Emperor's party by the time of the Boshin War: predominantly, but not entirely. Yamauchi Toyoshige urged the Shogun to return authority to the Emperor, avoid open warfare and so prevent Choshu and Satsuma from becoming even more powerful. When this became impossible, Tosa sided with the Emperor's forces.
However, this gives Yamauchi and their domain some advantages. They are skilled in diplomacy, and have a good deal of naval expertise which is reflected in their ships' experience and in their ability to bombard shore targets.
-Introduction to the Tosa campaign
To restore the Emperor of Japan to his place of power, thus ending the seven hundred year long rule of the Shogunate.
Capture and hold 26 provinces. In addition, ensure at least 50 provinces are held by forces loyal to the Emperor, including Musashi and Yamashiro, by the end of the year 1876.