But again he returned, supported by Kiyokado KOMATSU, who was the chief retainer (to belt on a sward) and after Kimmon no Hen (Conspiracy of Kimmon) in 1864, he was very active, and succeeded forming the Satsuma-Choshu Alliance and the Restoration of the Monarchy (Japan), and took initiative in the Boshin War.
しかし、家老小松清廉（帯刀）や大久保の後押しで復帰し、元治元年（1864年）の禁門の変以降に活躍し、薩長同盟の成立や王政復古(日本)に成功し、戊辰戦争を巧みに主導した。