勤王運動
Beyond the Delta, however, the French had much less to show for their efforts. Their first major victory against the insurgents, at Ba Dinh in January 1887, owed more to the folly of the Vietnamese commander Dinh Cong Trang, who deliberately challenged the French to a set-piece battle near the Annam-Tonkin border, than to the skill of the French high command. The Vietnamese defeat at Ba Dinh was a disaster for the Cần Vương movement in Annam, and cost the lives of many Vietnamese insurgents, but it did little to lessen the problems that the French faced in Tonkin.