The Keelung campaign (August 1884–April 1885) was a controversial military campaign undertaken by the French in northern Formosa (Taiwan) during the Sino-French War. After making a botched attack on Keelung in August 1884, the French landed an expeditionary corps of 2,000 men and captured the port in October 1884. Unable to advance beyond their bridgehead, they were invested inside Keelung by superior Chinese forces under the command of the imperial commissioner Liu Mingchuan. In November and December 1884 cholera and typhoid drained the strength of the French expeditionary corps, while reinforcements for the Chinese army flowed into Formosa via the Pescadores Islands, raising its strength to 35,000 men by the end of the war. Reinforced in January 1885 to a strength of 4,500 men, the Frenc