Career
He served under Ōtomo Sōrin. He was known as a skilled commander in the battle and also considered to be one of the pillars for the Otomo house serving in all their major campaigns. On 1578, Otomo Yoshishige attacked the Shimazu clan and Yamada Arinobu gathered 500 troops to hold ground at Taka Castle.
In the Battle of Mimigawa that followed, the Shimazu army defeated Otomo, who retreated under heavy losses.
Kamachi Akimori died in the battle.
