the boshin war was roughly divided into three phases: the battle of toba and fushimi phase which arose from the power struggle between the sat-cho and the shogunate under the new government; the tohoku war phase , including the hokuetsu war and the aizu war , which arose from the issue of punishment meted out to aizu and shonai domains; and the hakodate war phase in which the members of the former shogunate staged a final revolt . 戊辰戦争は、新政府下での薩長と幕府の主導権争いに起因する「鳥羽・伏見の戦い」の段階、会津藩・庄内藩の処分問題に起因する「東北戦争（北越戦争と会津戦争を含む）」の段階、旧幕府勢力の最後の抵抗となった「箱館戦争」の段階の3段階に大きく区分される。
