In 1864, the Tokugawa Shogunate commanded several clans to attack the Choshu Clan, because the Choshu was considered to have rebelled against the Emperor with the incident at Kinmon. In Shikoku, the Uwajima Clan and the Takamatu Clan were slow to prepare sending troops. The Choshu apologized presently, so the Tokugawa Shogunate stopped his attack. In 1865, the Tokugawa Shogunate decided to attack the Choshu again, because the Shogunate had maintained his authority. The Matsuyama Clan sent troops to Oshima, the eastern part of the Choshu Clan, but the Uwajima Clan tried to avoid sending troops. This was an active sign that the Shogunate's absolute power was declining.