Can Vuong
The Cần Vương (Hán tự: 勤王, lit. Aid the King) movement was a large-scale Vietnamese insurgency between 1885 and 1889 against French colonial rule. Its objective was to expel the French and install the boy emperor Hàm Nghi as the leader of an independent Vietnam. The movement lacked a coherent national structure, and consisted mainly of regional leaders who attacked French troops in their own provinces. The movement initially prospered, as there were only a few French garrisons in Annam, but failed after the French recovered from the surprise of the insurgency and poured troops into Annam from bases in Tonkin and Cochinchina. The insurrection in Annam spread and flourished in 1886, reached its climax the following year and gradually faded out by 1889.
Read more about Can Vuong: Background, The 'Huế Ambush', July 1885, Attacks On Vietnamese Christians, French Military Intervention From Tonkin, French Political Response, Siege of Ba Đình, January 1887, Intervention From Cochinchina, Capture of Hàm Nghi, 1888