. "The Pacification of Tonkin (1886\u201396) was a slow and ultimately successful military and political campaign undertaken by the French Empire in the northern portion of Tonkin (modern-day north Vietnam) to re-establish order in the wake of the Sino-French War (August 1884 \u2013 April 1885), to entrench a French protectorate in Tonkin, and to suppress Vietnamese opposition to French rule."@en . .