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. The land that was to become Bhutan House was ceded from Bhutan to British India in 1865 at the conclusion the Duar War and as a condition of the Treaty of Sinchula.