 The commanders of the Japanese forces were Konishi, Sō Yoshitoshi, Matsura Shigenobu, Arima Harunobu, Ōmura Yoshiaki and Gotō Mototsugu, all of whom (with the exception of Matsura) were Kirishitans, as were many of their men .While Sō Yoshitoshi attacked Busan, Konishi led a smaller force against the fort of Dadaejin, located a few kilometers to the southwest of Busan at the mouth of the Nantong River.Konishi Yukinaga's first attack was repelled by Yun Heungsin.