The Sino-French or Franco-Chinese War, also known as the Tonkin War, was a limited conflict fought from August 1884 to April 1885 between the French Third Republic and the Qing dynasty for influence in Vietnam. There was no declaration of war.
The Qing armies performed better than in their other nineteenth-century wars. Although French forces emerged victorious from most engagements, the Qing scored noteworthy successes on land, notably forcing the French to hastily withdraw from occupied Lạng Sơn in the late stages of the war, thus gaining control of the town and its surroundings. However, a lack of foreign support, French naval supremacy, and northern threats posed by Russia and Japan forced the Qing to enter negotiations.
The Qing ceded to France its sphere of influence over Northern and Central Vietnam, which respectively became the protectorates of Tonkin and Annam. Both sides ratified the Treaty of Tientsin and no diplomatic gain was reaped by either nation. On another note, the war strengthened the dominance of Empress Dowager Cixi over the Qing government but France securing its strategic objective did not prevent the collapse of French Prime Minister Jules Ferry's government for whom the Tonkin Affair was ignominious.
French interest in northern Vietnam dated from the late 18th century, when the political Catholic priest Pigneau de Behaine recruited French volunteers to fight for Nguyễn Ánh and help begin the Nguyễn dynasty, in an attempt to gain privileges for France and for the Roman Catholic Church. France began its colonial campaign in 1858, annexing several southern provinces in 1862 to form the colony of Cochinchina.
French explorers followed the course of the Red River through northern Vietnam to its source in Yunnan, arousing hopes for a profitable trade route with China that could bypass the treaty ports of the Chinese coastal provinces. The main obstacle to this idea, the Black Flag Army – a well-organized private army led by the formidable Liu Yongfu – was levying exorbitant "taxes" on Red River trade between Sơn Tây and Lào Cai on the Yunnan border.
In 1873, a small French force commanded by Lieutenant de Vaisseau Francis Garnier, exceeding his instructions, attacked northern Vietnam. Following a series of French victories against the Vietnamese, the Vietnamese government called on Liu Yongfu's Black Flags, who defeated Garnier's force beneath the walls of Hanoi. Garnier was killed in this battle, and the French government later disavowed his expedition.
Henri Rivière's expedition in Tonkin
In 1881, French Commandant Henri Rivière was sent with a small military force to Hanoi to investigate Vietnamese complaints about the activities of French merchants. In defiance of the instructions of his superiors, Rivière stormed the citadel of Hanoi on 25 April 1882. Although Rivière subsequently returned the citadel to Vietnamese control, his recourse to force provoked alarm both in Vietnam and in China.
The Vietnamese government, unable to confront Rivière with its own ramshackle army, once again enlisted the help of Liu Yongfu, whose well-trained and seasoned Black Flag soldiers would prove a thorn in the side of the French. The Vietnamese also sought for Chinese support. Vietnam had long been a tributary state of China, and China agreed to arm and support the Black Flags, and to covertly oppose French operations in Tonkin. Tu Duc requested the Qing court for help, and by September 1882 large Chinese regular armies were dispatched to occupy Vietnamese territories north of the Red River and vital towns such as Lang Son and Son Tay.
The Qing court also sent a strong signal to the French that China would not allow Tonkin to fall under French control. In the summer of 1882, troops of the Chinese Yunnan Army and Guangxi Army crossed the border into Tonkin, occupying Lạng Sơn, Bắc Ninh, Hưng Hóa and other towns. The French minister to China, Frédéric Bourée, was so alarmed by the prospect of war with China that in November and December he negotiated a deal with the Chinese statesman Li Hongzhang to divide Tonkin into French and Chinese spheres of influence. Neither of the parties to these negotiations consulted the Vietnamese.
Rivière, disgusted at the deal cut by Bourée, decided early in 1883 to force the issue. He had recently been sent a battalion of marine infantry from France, giving him just enough men to venture beyond Hanoi. On 27 March 1883, to secure his line of communications from Hanoi to the coast, Rivière captured the citadel of Nam Định with a force of 520 French soldiers under his personal command. During his absence at Nam Định, the Black Flags and Vietnamese made an attack on Hanoi, but Chef de Bataillon Berthe de Villers repulsed them in the Battle of Gia Cuc (Gia Quất) on 28 March. Rivière jubilantly reacted: 'This will force them to take forward their Tonkin Question!'
Rivière had perfect timing. He had expected to be cashiered for his capture of Nam Định; instead he found himself the hero of the hour. There had recently been a change of government in France, and the new administration of Jules Ferry strongly favoured colonial expansion. It therefore decided to back Rivière. Ferry and Foreign Minister Paul-Armand Challemel-Lacour denounced Bourée's agreement with Li Hongzhang and recalled the hapless French minister. They also made it clear to the Chinese that they were determined to place Tonkin under French protection. In April 1883, realising that the Vietnamese lacked the means of resisting the French effectively, the Chinese civil Mandarin Tang Jingsong (唐景崧) persuaded Liu Yongfu to take the field against Rivière with the Black Flag Army. This resulted in a year of Liu Yongfu's forces fighting an unconventional war.
On 10 May 1883 Liu Yongfu challenged the French to battle in a taunting message widely placarded on the walls of Hanoi. On 19 May Rivière confronted the Black Flags in the Battle of Paper Bridge, and the French suffered a disastrous defeat. Rivière's small force (around 450 men) attacked a strong Black Flag defensive position near the village of Cầu Giấy, a few miles to the west of Hanoi, known to the French as Paper Bridge (Pont de Papier). After initial successes the French were eventually enveloped on both wings; only with difficulty could they regroup and fall back to Hanoi. Rivière, Berthe de Villers and several other senior officers were killed in this action.
Rivière's death produced an angry reaction in France. Reinforcements were rushed to Tonkin, a threatened attack by the Black Flags on Hanoi was averted, and the military situation was stabilised.
On 20 August 1883 Admiral Amédée Courbet, who had recently been appointed to the command of the newly formed Tonkin Coasts Naval Division, stormed the forts which guarded the approaches to the Vietnamese capital Huế in the Battle of Thuận An, and forced the Vietnamese government to sign the Treaty of Huế, placing Tonkin under French protection.
At the same time the new commander of the Tonkin expeditionary corps, General Bouët, attacked the Black Flag positions on the Day River. Although the French mauled the Black Flag Army in the Battle of Phủ Hoài (15 August) and the Battle of Palan (1 September), they were unable to capture all of Liu Yongfu's positions, and in the eyes of the world the battles were tantamount to French defeats. Bouët was widely held to have failed in his mission, and resigned in September 1883. In the event, severe flooding eventually forced Liu Yongfu to abandon the line of the Day River and fall back to the fortified city of Sơn Tây, several miles to the west.
Confrontation between France and China
The French prepared for a major offensive at the end of the year to annihilate the Black Flags, and tried to persuade China to withdraw its support for Liu Yongfu, while attempting to win the support of the other European powers for the projected offensive. However, negotiations in Shanghai in July 1883 between the French minister Arthur Tricou and Li Hongzhang were terminated by the Qing government on receipt of a naively optimistic assessment by Marquis Zeng Jize, the Chinese minister to Paris, that the French government had no stomach for a full-scale war with China. Jules Ferry and the French foreign minister Paul-Armand Challemel-Lacour met a number of times in the summer and autumn of 1883 with Marquis Zeng in Paris, but these parallel diplomatic discussions also proved abortive. The Chinese stood firm, and refused to withdraw substantial garrisons of Chinese regular troops from Sơn Tây, Bắc Ninh and Lạng Sơn, despite the likelihood that they would be shortly engaged in battle against the French. As war with China seemed increasingly likely, the French persuaded the German government to delay the release of Dingyuan and Zhenyuan, two modern battleships then being constructed in German shipyards for China's Beiyang Fleet. Meanwhile, the French consolidated their hold on the Delta by establishing posts at Quảng Yên, Hưng Yên and Ninh Bình.