Kogo Jihen was an incident in which vassals of the Hachisuka clan, who lived in Sumoto City, attacked the second residence of chief retainer Kunitane Inada and a place of study and other places near the Sumoto-jo Castle on Awaji-shima Island, Tokushima domain of that time in 1870.
庚午事変（こうごじへん）は、1870年に当時の徳島藩淡路島洲本城下で洲本市在住の蜂須賀氏臣の武士が、家老稲田邦植の別邸や学問所などを襲った事件。