On May 21, nine members of the group sent to pacify the radicals, including Shigeru NARAHARA and Tsunayoshi OYAMA, engaged in a sword fight with the radicals at Teradaya, and six members including Arima were killed whilst the rest were arrested and sent back to Satsuma.
4月23日、鎮撫に遣わされた奈良原繁、大山綱良ら9人と急進派が寺田屋で斬り合いになり、有馬ら6人が死亡し、他は捕縛され薩摩へ送り返された。