The Ōtomo set up their Portuguese cannon, kunikuzuri or "destroyer of provinces", across the Kiribaragawa. The castle was soon reinforced by 1000 men under Yoshihisa's younger brother, Shimazu Iehisa.
Ōtomo forces deployed a Portuguese cannon, referred to as kunikuzuri or "regional annihilator," across the Kiribaragawa. The castle was reinforced shortly after by 1000 men under the command of Yoshihisa's younger brother, Shimazu Iehisa.