The Mountain of Battery is 200 ~ 300 meters above sea level. Its peak can be accessed by a trail lying to the right of the road about 1 km after one turns to the Provincial Highway No. 9 from Zhongshan Road of Su-ao Township at the bridgehead of the Baimi Bridge. The hill got its name due to the battery remains left on the top since the late Qing dynasty. Its extraordinary geographical location made it to be chosen as a military site defending the seaport. Standing on the hilltop provides a view of three places with "ao" – Su-ao, Beifangao and Nanfangao. However, the battery remains are no longer seen on the hill. What remains on the top is the re-built battery bases. The two batteries are kept inside the town hall. The hill was once where a brilliant story took place. In 1884 (during Emperor Kuang Hsu's reign), the Sino-French War broke out. When a local leader "Chen Hui-Huang" in Su-ao was instructed to protect Su-ao, he found out the defensive advantage of the overlooking hill and had batteries carried to the hilltop with the help of civilians. When the French army attacked Su-ao, the hill played an important role in repelling the French warships. In 1889, the guerrilla officer Zheng Yun-tai constructed batteries and barracks on the hill as a military fort to prevent enemies from future attacking. During the Japanese reign, the Japanese army built the "Kotohira-gu" Temple and the "Wishing for Peace" Monument on the hill. Due to the old age, the temple was changed to "Tianjun Temple" and the inscription on the monument was also defaced. The remains of the past no longer exist. Mottled and corroded by the weather, the ancient cannons molded in the Qing dynasty were therefore moved to the exhibition room in the Su-ao Town Hall. The two cannons currently on the base were re-built with funds donated by local enthusiastic gentry. One can have a wide field of vision on the hilltop. To the east lies the Su-ao Harbor in full view from afar while to the west sits the stree