The Treaty of Huế, concluded on 25 August 1883 between France and Vietnam, recognised a French protectorate over Annam and Tonkin. Dictated to the Vietnamese by the French administrator François-Jules Harmand in the wake of the French military seizure of the Thuận An forts, the treaty is often known as the 'Harmand Treaty'. Considered overly harsh in French diplomatic circles, the treaty was never ratified in France, and was replaced on 6 June 1884 with the slightly milder 'Patenôtre Treaty' or 'Treaty of Protectorate', which formed the basis for French rule in Vietnam for the next seven decades.
The treaty was dictated to the Vietnamese in the wake of the French victory at the Battle of Thuận An (20 August 1883) by Jules Harmand, the French civil commissioner-general for Tonkin. The capture of the Thuận An forts exposed Huế to immediate attack, and overawed the Vietnamese court. Shortly after the battle Nguyen Van Thuong, the Vietnamese foreign minister, accompanied by Monsignor Gaspar, the French bishop of Huế, concluded a 48-hour armistice with the French. Nguyen agreed to the evacuation of twelve inland forts defending the river, the destruction of their ammunition and the removal of the barrages. Harmand then sailed upriver to Huế aboard a steam launch.
At Huế, Harmand presented a brutal ultimatum to the Vietnamese court, written in a style reminiscent of the Melian dialogue of Thucydides and couched in terms that brooked no compromise. The emperor and his ministers were to have no opportunity to discuss the terms of the treaty, or to haggle over individual clauses. They must accept the treaty in full, or the terrible vengeance of France would fall upon them:
If we wanted to, we could destroy your dynasty root and branch and seize for ourselves the entire kingdom, as we have done in Cochinchina. You know very well that this would present no difficulty to our armies. For a moment, you hoped to find help from a great empire on your borders, which has on several occasions posed as your suzerain. But even if such a suzerainty ever existed, and whatever the consequences that might once have resulted from it, it is now nothing but a historical curiosity. Now here is a fact which is quite certain. You are completely at our mercy. We have the power to seize and destroy your capital and to starve you all to death. It is up to you to choose between war and peace. We do not wish to conquer you, but you must accept our protectorate. For your people it is a guarantee of peace and prosperity. For your government and your court, it is the only chance of survival. We give you forty-eight hours to accept or reject, in their entirety and without discussion, the terms which we are magnanimously offering you. We believe that there is nothing in them dishonourable to you, and if they are carried out with sincerity on both sides they will bring happiness to the people of Annam. But if you reject them, you can expect to suffer the most terrible of misfortunes. The worst catastrophe you are capable of imagining will fall far short of what will actually befall you. The empire of Annam, its royal dynasty and its princes and court will have voted for their own extinction. The very name of Vietnam will be erased from history.