The First Opium War: Britain’s Drug War Against China and the Treaty of Nanking

The First Opium War (1839–1842) was the first of the nineteenth-century conflicts in which a Western industrial power used military force to pry open the Qing Empire. Its immediate cause was a dispute over the opium trade, but its deeper cause was the structural imbalance between an Industrial-Revolution Britain in need of a market for its goods and a Qing state that had nothing it wanted to buy. The war ended in the Treaty of Nanking, the first of the “unequal treaties,” and the beginning of what Chinese historians would later call the “century of humiliation.” The wider background is in the crises of the late Qing and in the larger story of the fall of imperial China.

The Opium Trade Before the War

British demand for Chinese tea, silk, and porcelain had been growing since the eighteenth century, but China had little interest in European manufactured goods. The result was a chronic trade deficit for Europe, balanced in the early period by the influx of American silver. As the supply of American silver tightened in the early nineteenth century, the British East India Company found a new way to square the account: opium grown in Bengal, sold at auction in Calcutta, and smuggled into China through Canton by British and Indian merchants.

By the late 1830s, the annual opium inflow to China had reached some 40,000 chests, each chest weighing about 60 kilograms. Domestic production supplemented the foreign supply, and by the late Qing perhaps one in ten adult males in some provinces was addicted. The silver that should have been flowing into China was now flowing out. The economic history of the late imperial crisis describes the structural effects of the silver drain on the Qing fiscal system.

Lin Zexu and the Destruction of the Opium at Humen

In 1838 the Daoguang emperor, alarmed by reports of widespread addiction and silver flight, appointed the tough and incorruptible official Lin Zexu (林则徐) as imperial commissioner with extraordinary powers to suppress the trade. Lin arrived in Canton in March 1839 and immediately confronted the foreign merchants, demanding that they surrender their stocks of opium and sign a bond promising not to trade in it again.

The British Chief Superintendent of Trade, Charles Elliot, eventually persuaded the merchants to hand over their opium to the British government — about 1,200 tons in total — on the understanding that the British government would compensate them. Lin then supervised its destruction. Between 3 and 25 June 1839, in a famous episode at Humen (虎门) on the Pearl River delta, the chests were broken open, the opium was mixed with salt and lime, and the resulting slurry was flushed into the tidal river. The destruction was public, deliberate, and deeply humiliating to British commercial interests. The military history of the Qing crisis treats the resulting conflict.

Lin also forced the foreign community in Canton to sign bonds promising not to trade in opium, and he executed a few Chinese smugglers. In November 1839, in an incident at Kowloon, British and Chinese ships exchanged fire, and several small engagements escalated the dispute into a full war. The wider Qing response included the replacement of Lin by Qishan, a more conciliatory commissioner, in late 1840.

The British Expedition

The British response was the first major war fought with steam-powered gunboats, modern rifles, and iron cannon — and the Qing, with their eighteenth-century coastal defenses and antiquated artillery, were utterly unprepared. Lord Palmerston, the British foreign secretary, sent an expeditionary force under Admiral Sir George Elliot and later Sir Henry Pottinger, who was appointed the first governor of Hong Kong by the war’s end.

The war fell into three phases. The first, from late 1839 to mid-1841, saw British naval supremacy off the southern coast, the occupation of Hong Kong Island in January 1841, and a Chinese negotiation under Qishan that produced the Convention of Chuenpi, ceding Hong Kong and opening five ports. The Daoguang emperor repudiated the convention, and fighting resumed.

The second phase, in 1841, included the second British occupation of Hong Kong and the capture of several southern coastal cities. The third phase, in 1842, saw the British expedition sail north to threaten the Yangzi valley. The capture of Zhenjiang on the Grand Canal in July 1841 cut the imperial grain transport route to the north and persuaded the Qing to negotiate. The history of Chinese imperial dynasties puts the Qing defeat in the context of a long decline.

The military imbalance was striking. British infantry armed with percussion-cap muskets could fire three or four rounds per minute; Qing matchlock muskets, often unusable in wet weather, fired at most one. British steam frigates could move upriver regardless of wind or current; Chinese junks could not. The Qing commander Qiying signed the Treaty of Nanking on 29 August 1842 aboard HMS Cornwallis in Nanjing.

The Treaty of Nanking (1842)

The Treaty of Nanking was the first in a series of what Chinese nationalists would later call the “unequal treaties” — a phrase that captured both the legal and the moral imbalance. Its main terms were:

The cession of Hong Kong Island to Britain “in perpetuity.” Hong Kong would remain a British possession until 1997.
The opening of five treaty ports to British trade: Canton (Guangzhou), Amoy (Xiamen), Foochow (Fuzhou), Ningpo (Ningbo), and Shanghai.
The abolition of the old Canton system, in which all foreign trade had been confined to a single guild of Chinese merchants.
The establishment of a fixed tariff of about 5 percent, which would be raised or lowered only with British consent.
The payment of an indemnity of 21 million silver dollars to cover the cost of the destroyed opium, of which 3 million was for the merchants and the rest for war expenses.
Most-favored-nation status, meaning that any future concession granted to another foreign power would automatically apply to Britain.

The treaty did not mention opium directly. The British had fought the war, in their official framing, to defend the honor of the Crown and the right of British subjects to trade; the British government explicitly disavowed the opium trade in the treaty. In practice, however, the opium trade resumed almost immediately and grew rapidly. The crises of the late Qing treat the unequal treaties as a system imposed over the next six decades.

Lin Zexu’s Fate and the Meaning of the War

Lin Zexu, who had been a fierce anti-opium campaigner, was dismissed and exiled to Xinjiang for his role in starting the war. He was later pardoned and returned to office, dying in 1850. He became a national hero in twentieth-century China; the destruction of the opium at Humen is still commemorated.

For China, the war was a humiliation and a warning. A state that had imagined itself the center of civilization had been defeated at sea by a small island nation it had hardly noticed. The lesson was drawn differently by different groups: some concluded that China needed to learn Western military technology, others that it needed deeper reform of its institutions, and others that the Qing court itself was the problem. All three reactions would shape the next seventy years, leading through the Taiping Rebellion and beyond to the revolution of 1911.

The Century of Humiliation

The phrase “century of humiliation” (百年屈辱) was coined in the early twentieth century and later became a central theme of Chinese nationalist historiography. It refers to the period from the First Opium War to the founding of the People’s Republic in 1949, a century in which China suffered a series of foreign incursions, unequal treaties, lost wars, and territorial concessions. The First Opium War is the opening chapter of that long story. The deeper history of the Qing crisis, including the second war with Britain, the war with France, the war with Japan, and the Boxer Rebellion, is in the crises of the late Qing and the overarching account of the fall of imperial China.