Shimazu's army launched a successful raid against the Otomo army, and set up camp on the Nejirozaka (a hillside) across the Omaru-gawa River from the camp of the Otomo army.
島津軍は大友軍に奇襲をかけて成功し、小丸川を挟んで大友軍の対岸の根城坂に着陣した。