[2] In 1542, Dōsan became the representative of the Toki clan and ruled over Mino Province as such.

Yoshitatsu, who was living in Sagiyama Castle at the time, heard of his father's plans and, in 1556, killed his two brothers in the family residence on Mount Inaba, starting the intra-family skirmish.

Yoshitatsu was able to gain the support of a large portion of the family's soldiers, gathering approximately 17,500 men.

Yoshitatsu handily won the battle, which ended in Dōsan's death.

[2][3] Dōsan's son-in-law, Oda Nobunaga, had sent troops to support him, but they did not reach the battle in time to offer any help.