黒旗軍
In April 1883 the Chinese civil mandarin Tang Jingsong, who had been sent to Vietnam in 1882 to assess the Vietnamese government's ability to resist French encroachment in Tonkin, reconciled the quarrel between Liu and Hoang and persuaded Liu to take the field in earnest with the Black Flag Army. Liu's decision to commit the Black Flag Army against the French was to have profound consequences, setting in train a chain of events that culminated eventually in the Sino-French War (August 1884–April 1885).