The Treaty of Sinchula stood until 1910, when Bhutan and British India signed the Treaty of Punakha, effective until 1947.
The British on invitation of the Cooch King intervened and captured the fort which was formally handed over to the British on November 11, 1865 as part of Treaty of Sinchula.
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Under the new agreement agreement, India returned the land around Deothang, subject of part of the 1865 Anglo-Bhutanese War.