Dee ihe na-esote paragraf a - Site na 1780, ndị Gurkha mere ọtụtụ mgbalị iji weghara mpaghara Darjeeling dum. Ka ọ na-erule ná mmalite nke narị afọ nke 19, ha emeriela Sikkim ruo n'ebe ọwụwa anyanwụ ruo n'Osimiri Teesta ma merie ma chịkọta Terai, ógbè ahụ dum bụzi nke Nepal. Ka ọ dị ugbu a, ndị agha Britain nọ na-egbochi ndị Gọkhas ka ha ghara ịgafe ókèala niile dị n'ebe ugwu. Agha Anglo-Nepalese
agha dara na 1814, nke butere mmeri nke ndị Gurkhas ma mesịa duga na mbinye aka nke Nkwekọrịta Sugauli na 1816. Dabere na nkwekọrịta ahụ, Nepal ga-enyefe mpaghara niile ndị ahụ sitere na Chogyal nke Sikkim na British East India Company (ya bụ, mpaghara dị n'etiti Osimiri Mechi na Osimiri Teesta). Mgbe e mesịrị na 1817, site na Nkwekọrịta nke Titalia, British East India Company weghachiri Chogyal nke Sikkim, weghachite ala niile dị n'etiti Osimiri Mechi na Osimiri Teesta na Chogyal nke Sikkim ma kwado ọbụbụeze ya.