Chikuzen Province
In 1585, Yoshihisa took Otomo's Iwaya castle resulted after the Shimazu invasion of Chikuzen Province. Later, the Otomo leaders travelled to Osaka itself, seeking to persuade Hideyoshi to help. Hideyoshi was impressed with this embassy, and presumably agreed to help; Yoshihisa, seeing that Hideyoshi was prepared to invade, sent a message to Hideyoshi, claiming that he had attacked the other clans in self-defence, but Hideyoshi refused and leads his forces to Kyushu.