Britain and Qing China signed the 1890 Convention of Calcutta, which recognized Britain’s protectorate over Sikkim and demarcated the Sikkim–Tibet border. Tibet’s government later rejected the agreement, highlighting a gap between Qing claims of authority and Tibet’s on-the-ground autonomy. This unresolved border-and-authority dispute became a key pretext for later British pressure on Tibet.
A British-Indian mission led by Francis Younghusband crossed the Jelep La into Tibet as the Tibet Frontier Commission, nominally to negotiate and settle disputes. The expedition was backed by a large, well-supplied force, signaling that diplomacy was tied to coercion. Tibet did not send officials to meet the mission, and tensions escalated as the British advanced beyond the frontier.
After wintering near the border, the British-Indian column moved forward from its camp at Tuna toward central Tibet. The march turned the mission into a military operation aimed at forcing negotiations on British terms. This advance set the stage for the first major clash with Tibetan forces blocking the route.
At Guru, Tibetan troops formed a roadblock and refused to disperse; a confrontation escalated into a sudden, lopsided firefight. British-Indian troops used modern rifles and Maxim machine guns against largely outmatched Tibetan forces, causing very heavy Tibetan casualties. The incident hardened Tibetan resistance and became a defining symbol of the expedition’s violence.
The British column reached Gyantse, a strategic town on the route to Lhasa, and established a mission post. Tibetan forces soon attacked the British position, and fighting around Gyantse continued as both sides sought control of the fortifications. The struggle at Gyantse delayed the British advance but also justified escalation in British planning.
At the Karo La pass, Tibetan fighters again tried to block the British-Indian advance. The British overcame the position and continued pressing east, while Tibetan forces increasingly shifted to delaying tactics and local defense. These mountain battles showed how the expedition combined military movement with pressure for a political settlement in Lhasa.
British-Indian forces stormed Gyantse Dzong, a major fortress that anchored Tibetan defenses in the region. The capture broke organized resistance around Gyantse and opened the main road toward Lhasa. With Gyantse secured, the expedition could shift from a contested advance to a direct push on Tibet’s capital.
The expedition entered Lhasa and found that the 13th Dalai Lama had already left the city, removing the leader most able to negotiate for Tibet. The Qing amban (imperial representative) present in Lhasa said he lacked authority to sign a treaty. This leadership vacuum pushed negotiations onto Tibetan officials under direct military pressure.
Tibetan representatives signed the Convention of Lhasa at the Potala Palace, ending the immediate military crisis. The agreement opened Yatung, Gyantse, and Gartok to British trade, imposed a large indemnity, and restricted Tibet’s dealings with other foreign powers. It also linked payment to British control of the Chumbi Valley, making the treaty both commercial and strategic.
After criticism and practical concerns, British authorities revised the 1904 settlement and ratified it at Simla. The revision reduced the indemnity and eased some of the harshest provisions while keeping the core goals of trade access and strategic leverage. This step helped Britain shift from battlefield gains to a more durable diplomatic arrangement.
Britain and Qing China signed a follow-on treaty in Beijing, reframing the 1904 outcome through direct Britain–China diplomacy. Britain agreed not to annex or interfere in Tibet’s administration, while recognizing China’s position in Tibet; China agreed not to allow other foreign powers to interfere there. The agreement showed that Tibet’s status was being negotiated by empires as much as by Tibetans themselves.
After years away following the British advance on Lhasa, the 13th Dalai Lama returned to Tibet in December 1908. His return reflected a new political reality: Tibet had faced a major foreign invasion, and Qing officials also sought tighter control after the shock of 1904. The Dalai Lama’s later reforms and foreign-policy choices were shaped by these pressures.
Qing China sent a military expedition into Tibet in 1910, driven in part by fears of losing influence after the 1903–1904 British intervention. The operation aimed at establishing more direct Qing administration, deepening turmoil in Lhasa politics. The Dalai Lama fled again, and Sino-Tibetan relations deteriorated further.
British expedition to Tibet and the 1904 Convention of Lhasa (1903–1904)