In May 1578, the Shimazu had been advancing north from their
Satsuma Province to confront the
Ōtomo clan, when
Ōtomo Sōrin (retired
daimyō) and his heir
Yoshimune, moved south to attack Takajo castle. The Christian Ōtomo army destroyed Buddhist and Shinto religious buildings along the way. Later, The Ōtomo crossed the
Mimigawa and laid siege to on 20 October, The Takajo garrison only have 500 men led by
Yamada Arinobu. 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.
Shimazu Yoshihisa had a dream the night before the battle, which he turned into a poem, and the Shimazu considered a good omen: ==Battle==