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 Ming-ch'uan.