 In 1910, Sikkim Political Officer and Tibetologist Sir Charles Alfred Bell engaged Bhutan and signed the Treaty of Punakha and other agreements that had the effect of assigning land in Motithang (Thimphu) and a hill station between Chukha and Thimphu to the British, assigning a portion of Kalimpong to Bhutan, and doubling the "per annum" subsidy from Britain to Bhutan.The land around the Kalimpong estate had previously been ceded from Bhutan to British India at the conclusion the Bhutan War and as a condition of the Treaty of Sinchula in 1865.