甲申政变
The battle arose from an attempt by part of the Chinese Nanyang Fleet (Southern Seas fleet) to relieve the French blockade of Formosa (Taiwan). On 18 January 1885 the Chinese cruisers "Nanchen" (南琛), "Nanrui" (南瑞) and "Kaiji" (開濟) left Shanghai, accompanied by the frigate "Yuyuan" (馭遠) and the composite sloop "Chengqing" (澄慶), and sailed towards Formosa. The Chinese flotilla was under the command of Admiral Wu Ankang (吳安康). The Nanyang ships were originally to have been accompanied by "Chaoyong" (超勇) and "Yangwei" (揚威), two relatively modern cruisers from the Beiyang Fleet, under the command of the German 'guest-admiral' Siebelin, but Li Hongzhang diverted these two Beiyang ships to Korean waters. (Tension between China and Japan over Korea was running high at the period, following Yuan Shihkai's defeat of the Gapsin Coup in December 1884.)