Following Imperial Prince Taruhito ARISUGAWA, who was Tosei Daisotoku (great leader who journeys east), who led his army out of Kyoto, one small company from the Yamagunitai received orders to accompany the prince eastwards.
東征大総督有栖川宮熾仁親王の京都出陣に伴い、山国隊に1小隊東征の指令が下った。