2.3 The Second Opium War and the Treaty of Tianjin

The Second Opium War

The Second Opium War (1856–1860) was the second major military conflict between China and Western powers over trade access and diplomatic privileges. It deepened the pattern established by the First Opium War: foreign powers using military force to extract concessions from the Qing dynasty, further undermining Chinese sovereignty.

Causes of the Second Opium War

The First Opium War ended with the Treaty of Nanjing (1842), but neither side was satisfied with the outcome. China resented the treaty's terms, while Britain and France wanted even broader access to Chinese markets and the interior of the country. Three developments pushed tensions into open war:

• The Arrow Incident (1856): Chinese officials boarded the Arrow, a Chinese-owned ship registered in Hong Kong, and arrested its crew on suspicion of piracy and smuggling. Britain claimed this violated treaty protections for ships flying the British flag and demanded a formal apology. When China refused, Britain used the incident as justification for military action. Whether the ship's British registration had actually expired at the time remains debated, but Britain pressed the issue regardless.
• The murder of Auguste Chapdelaine: French missionary Auguste Chapdelaine was executed by local Chinese authorities in Guangxi province in 1856. France seized on this as a pretext to join Britain in the war, citing the need to protect Catholic missionaries and French commercial interests.
• Broader Western frustrations: Both Britain and France wanted to renegotiate the treaties from the First Opium War. They sought the right to station diplomats in Beijing, open more ports, and legalize the opium trade that was still technically prohibited under Chinese law. The existing Treaty of Nanjing had a revision clause that was supposed to allow renegotiation after twelve years, but Qing officials had resisted meaningful talks.

Military Campaigns and Battles

The war unfolded in two phases, with fighting concentrated along China's southern coast and then pushing north toward Beijing.

1. Capture of Canton (1857): British and French forces attacked and seized Guangzhou (Canton) in late 1857. They installed a joint Anglo-French administration over the city, effectively removing Qing authority from one of China's most important trading hubs.
2. Battle of the Taku Forts (1858–1860): The Taku (Dagu) Forts guarded the mouth of the Hai River, the waterway leading toward Beijing and the nearby city of Tianjin. Allied forces captured the forts in May 1858, which pressured the Qing into signing the Treaty of Tianjin. The following year, when the Qing attempted to block ratification, a renewed Allied assault was initially repelled in June 1859. A much larger force returned in August 1860 and overwhelmed the Chinese defenders, opening the route to the capital.
3. Battle of Baliqiao (1860): With the Taku Forts taken, British and French troops advanced inland. At Baliqiao (Palikao), just outside Beijing, they defeated a Qing force that included Mongol cavalry. The road to Beijing was now undefended.
4. Destruction of the Old Summer Palace (1860): After discovering that Qing officials had tortured and killed captured Allied negotiators and soldiers, British commander Lord Elgin ordered the burning of the Yuanmingyuan (Old Summer Palace). Troops looted the palace's vast art collections before setting it ablaze. The destruction was deliberately intended as a punishment directed at the Qing court rather than at ordinary Chinese civilians. The ruins remain a powerful symbol of national humiliation in China today.

The Treaty of Tianjin

Terms and Impact

The Treaty of Tianjin was signed in June 1858 between China and four foreign powers: Britain, France, Russia, and the United States. When the Qing court attempted to block ratification the following year, the renewed fighting of 1859–1860 forced China to accept even harsher terms in the Convention of Beijing (1860). Together, these agreements imposed sweeping changes:

• More treaty ports opened: Eleven additional ports were opened to foreign trade and residence, extending the foreign commercial presence far beyond the five ports granted after the First Opium War. Foreign ships also gained the right to navigate the Yangtze River, opening China's interior waterways to Western commerce.
• Legalization of the opium trade: The treaty formally legalized the import of opium, removing any legal basis for China to restrict the drug that had devastated communities and drained silver from the economy.
• Foreign missionaries granted interior access: Christian missionaries gained the right to travel and proselytize freely throughout China's interior, not just in coastal treaty ports. This became a persistent source of local conflict in the decades that followed, as missionary activity sometimes clashed with local customs and authority structures.
• Foreign diplomats in Beijing: Western nations won the right to station permanent diplomatic representatives in the capital, a concession the Qing court had long resisted because it challenged the traditional tributary system in which foreign states were expected to approach the emperor as subordinates, not equals.
• Fixed tariffs: Import and export duties were set at low, fixed rates (around 5%), stripping China of the ability to use tariffs to protect domestic industries.
• War indemnities: China was required to pay large financial reparations to Britain and France, further straining Qing finances that were already under pressure from the ongoing Taiping Rebellion (1850–1864).

The cumulative effect was a dramatic erosion of Chinese sovereignty. The Qing government lost control over trade policy, religious activity within its borders, and even who could reside in major Chinese cities.

The Role of Western Powers

Britain and France drove the war militarily and diplomatically, using force to compel the Qing court to accept their demands. Russia and the United States took a different approach. Neither committed troops to the fighting, but both participated in the treaty negotiations and secured their own commercial and diplomatic privileges by leveraging Anglo-French military victories.

Russia was especially opportunistic. While Britain and France focused on trade concessions, Russia pressured the weakened Qing government into ceding vast territories in Manchuria and the Pacific coast through the Treaty of Aigun (1858) and the Convention of Beijing (1860). This included the land where Russia would build the port city of Vladivostok. These territorial losses amounted to roughly 1 million square kilometers, making Russia one of the biggest beneficiaries of the Second Opium War despite never firing a shot.

The Treaty of Tianjin was imposed under duress, with China negotiating from a position of military defeat. This power imbalance defined the entire "unequal treaty" system: agreements that carried the formal appearance of diplomacy but were dictated by the threat or reality of armed force. A key feature of these treaties was the most-favored-nation clause, which meant that any concession granted to one foreign power automatically extended to the others. This created a ratchet effect where each new treaty expanded the privileges of every treaty power simultaneously. The Treaty of Tianjin set a template that other Western powers and Japan would follow in extracting further concessions from China through the rest of the nineteenth century.