The battle took place in the aftermath of a successful siege by the Mōri of the Ōtomo's
Tachibana castle, which sat just outside the boundaries of today's
Fukuoka City. The two armies met on the shores of
Hakata Bay, at Tatarahama, but were evenly matched, and both retreated. In order to end the deadlock, the Ōtomo made an alliance with the
Amago clan. The Mōri clan's battles with this larger allied force occupied it to such an extent that
Yamanaka Yukimori and
Amago Katsuhisa, as part of their arrangement with the Ōtomo, were able to take
Izumo province, some distance away on
Honshū, and that the Mōri became pressured into abandoning Tachibana. ==References==