Pedzisa mutsara unotevera: Mauto eGorkha anobva kuNepal akapinda muDarjeeling muma1780, akarwisa guta guru reSikkim, Rabdentse, ndokubatanidza nharaunda kusvika kuRwizi Teesta kupinda muNepal. Pakazosvika 1816 nharaunda yose yaizivikanwa seSikkim yeBritain yakanga yava yeNepal. Mushure mokunge
Hondo yeAnglo-Gorkha, Nepal yakapa chikamu chimwe muzvitatu chenzvimbo dzayo kuBritain pasi pe 1816 Sugauli Treaty, iyo yaisanganisira nzvimbo yepasi pakati peMechi neTeesta Rivers. Musi wa 10 Kukadzi 1817, maBritish akadzorera nzvimbo yepasi pakati peMechi neTeesta kuSikkimese Chogyal pasi peChibvumirano cheTitalia.