方伯谦与丰岛海战郑守正丰岛海战是中日甲午战争之序战，发生于１８９４年７月２５日（清光绪二十年六月二十三日）。丰岛位于牙山锚地以西约２０，故是役亦称牙山海战。六月二十日，北洋海军济远舰管带方伯谦奉命率该舰并广乙、威远三舰从威海启航，于二十一日抵牙山掩护... Fang Boqian and Toshima Island Naval Battle Zheng Shouzheng The Toshima Island naval battle was a prewar battle between the Sino-Japanese Sino-Japanese War of 1894, which took place on July 25, 1894 (Emperor Guangxu, June 23, 20). Toshima is located about 20 km west of Asan anchorage, so it is also known as Asan sea battle. On June 20, Beipei Navy, the far-away naval force of the Beiyang Navy, was ordered to rate the ship and to make the B-3 ship of Weiyuan sail from Weihai and cover the Ashenvale on the 21st.