On January 8, 1910, Sikkim Political Officer and Tibetologist Sir Charles Alfred Bell engaged Bhutan and signed the Treaty of Punakha. The Treaty of Punakha amended two articles of the 1865 treaty: the British agreed to double their annual stipend to 100,000 rupees and "to exercise no interference in the internal administration of Bhutan." In turn, Bhutan agreed "to be guided by the advice of the British Government in regard to its external relations." The Treaty of Punakha guaranteed Bhutan's defense against China; China, in no position to contest British power, conceded the end of the millennium-long Tibetan-Chinese influence. It also assigned land in Motithang (Thimphu) and a hill station between Chukha and Thimphu to the British, assigning a portion of Kalimpong (Bhutan House) to Bhutan.