In early February 1885 part of Admiral
Amédée Courbet's
Far East Squadron left
Keelung to head off a threatened attempt by part of the Chinese
Nanyang Fleet (Southern Seas fleet) to break the French
blockade of Formosa (Taiwan). On 11February Courbet's task force met the cruisers
Kaiji (開濟),
Nanchen (南琛) and
Nanrui (南瑞), three of the most modern ships in the Chinese fleet, near Shipu Bay, accompanied by the frigate (馭遠) and the composite sloop
Chengqing (澄慶). The Chinese flotilla, under the command of Admiral Wu Ankang (吳安康), scattered as the French approached, and while the three cruisers successfully escaped, the French succeeded in trapping
Yuyuen and
Chengqing in Shipu Bay. On the night of 14February, during the
Battle of Shipu, a French torpedo attack crippled both ships: a French spar torpedo hit
Yuyuen while shells from her guns struck
Chengqing On 25February 1885 Admiral Courbet received instructions to implement a 'rice blockade' to prevent transport of the commodity from
Shanghai to northern China. On 28February he arrived off Zhenhai Bay, en route for Shanghai, with the ironclads and , the unprotected cruiser and the troopship
Saône. Suspecting that
Kaiji,
Nanchen and
Nanrui had taken refuge in Zhenhai Bay, Courbet scouted the entrance to the bay at dawn on 1March. Not only could he see the masts of the three Chinese cruisers, but was also able to identify four other Chinese warships: the composite sloop
Chaowu (超武), the wooden transport
Yuankai (元凱) as well as two
alphabetical gunboats. The entrance to the bay had been blocked by a barrage of junks sunk by the Chinese authorities while two recently built forts defended the approach. == The 'Battle of Zhenhai', 1 March 1885 ==