Under the Cooch Behari agreement with the British, a British expeditionary force drove the Bhutanese garrison out of Cooch Behar and invaded Bhutan in 1772-73. The druk desi petitioned Lhasa for assistance from the Panchen Lama, who was serving as regent for the youthful Dalai Lama. In ÍÍÍÍcorrespondence with the British governor general of India, however, the Panchen Lama instead castigated the druk desi and invoked Tibet's claim of suzerainty over Bhutan.

Failing to receive help from Tibet, the druk desi signed a Treaty of Peace with the British East India Company on April 25, 1774. Bhutan agreed to return to its pre-1730 boundaries, paid a symbolic tribute of five horses to Britain, and, among other concessions, allowed the British to harvest timber in Bhutan. Subsequent missions to Bhutan were made by the British in 1776, 1777, and 1783, and commerce was opened between British India and Bhutan and, for a short time, Tibet. In 1784 the British turned over to Bhutanese control Bengal Duars territory, where boundaries were poorly defined. As in its other foreign territories, Bhutan left administration of the Bengal Duars territory to local officials and collected its revenues. Although major trade and political relations failed to develop between Bhutan and Britain, the British had replaced the Tibetans as the major external threat.

Boundary disputes plagued Bhutanese-British relations. To reconcile their differences, Bhutan sent an emissary to Calcutta in 1787, and the British sent missions to Thimphu in 1815 and 1838. The 1815 mission was inconclusive. The 1838 mission offered a treaty providing for extradition of Bhutanese officials responsible for incursions into Assam, free and unrestricted commerce between India and Bhutan, and settlement of Bhutan's debt to the British. In an attempt to protect its independence, Bhutan rejected the British offer. Despite increasing internal disorder, Bhutan had maintained its control over a portion of the Assam Duars more or less since its reduction of Cooch Behar to a dependency in the 1760s. After the British gained control of Lower Assam in 1826, tension between the countries began to rise as Britain exerted its strength. Bhutanese payments of annual tribute to the British for the Assam Duars gradually fell into arrears, however. The resulting British demands for payment and military incursions into Bhutan in 1834 and 1835 brought about defeat for Bhutan's forces and a temporary loss of territory.

The British proceeded in 1841 to annex the formerly Bhutanesecontrolled Assam Duars, paying a compensation of 10,000 rupees a year to Bhutan. In 1842 Bhutan gave up control to the British of some of the troublesome Bengal Duars territory it had administered since 1784.

Charges and countercharges of border incursions and protection of fugitives led to an unsuccessful Bhutanese mission to Calcutta in 1852. Among other demands, the mission sought increased compensation for its former Duars territories, but instead the British deducted nearly 3,000 rupees from the annual compensation and demanded an apol 100ogy forfor alleged plundering of British-protected lands by members of the mission. Following more incidents and the prospect of an anti-Bhutan rebellion in the Bengal Duars, British troops deployed to the frontier in the mid-1850s. The Sepoy Rebellion in India in 1857-58 and the demise of the British East India Company's rule prevented immediate British action. Bhutanese armed forces raided Sikkim and Cooch Behar in 1862, seizing people, property, and money. The British responded by withholding all compensation payments and demanding release of all captives and return of stolen property. Demands to the druk desi went unheeded, as he was alleged to be unaware of his frontier officials' actions against Sikkim and Cooch Behar.

Britain sent a peace mission to Bhutan in early 1864, in the wake of the recent conclusion of a civil war there. The dzongpon of Punakha--who had emerged victorious--had broken with the central government and set up a rival druk desi while the legitimate druk desi sought the protection of the ponlop of Paro and was later deposed. The British mission dealt alternately with the rival ponlop of Paro and the ponlop of Tongsa (the latter acted on behalf of the druk desi), but Bhutan rejected the peace and friendship treaty it offered. Britain declared war in November 1864. Bhutan had no regular army, and what forces existed were composed of dzong guards armed with matchlocks, bows and arrows, swords, knives, and catapults. Some of these dzong guards, carrying shields and wearing chainmail armor, engaged the well-equipped British forces.

The Duar War (1864-65) lasted only five months and, despite some battlefield victories by Bhutanese forces, resulted in Bhutan's defeat, loss of part of its sovereign territory, and forced cession of formerly occupied territories. Under the terms of the Treaty of Sinchula, signed on November 11, 1865, Bhutan ceded territories in the Assam Duars and Bengal Duars, as well as the eighty-three-square-kilometer territory of Dewangiri in southeastern Bhutan, in return for an annual subsidy of 50,000 rupees.

In the 1870s and 1880s, renewed competition among regional rivals--primarily the pro-British ponlop of Tongsa and the anti-British, pro-Tibetan ponlop of Paro--resulted in the ascendancy of Ugyen Wangchuck, the ponlop of Tongsa. From his power base in central Bhutan, Ugyen Wangchuck had defeated his political enemies and united the country following several civil wars and rebellions in 1882-85. His victory came at a time of crisis for the central government, however. British power was becoming more extensive to the south, and in the west Tibet had violated its border with Sikkim, incurring British disfavor. After 1,000 years of close ties with Tibet, Bhutan faced the threat of British military power and was forced to make serious geopolitical decisions. The British, seeking to offset potential Russian advances in Lhasa, wanted to open trade relations with Tibet. Ugyen Wangchuck saw the opportunity to assist the British and in 1903-4 volunteered to accompany a British mission to Lhasa as a mediator. For his services in securing the Anglo-Tibetan Convention of 1904, Ugyen Wangchuck was knighted and thereafter continued to accrue greater power in Bhutan.

Data as of September 1991