Bungo Province
Shimazu Iehisa and Shimazu Toyohisa, joined by over 10,000 troops, surrounded Tsuruga Castle (now Oita City, Oita Prefecture) near the Hetsugigawa River in Bungo Province at the time. The forces of Chosokabbe Motochika, Chosokabe Nobuchika, Sengoku Hidehisa, Sogō Masayasu, and others came here as an advance corps of the Toyotomi army.