Pedzisa mutsara unotevera: Kubvira muna 1780, vaGurkha vakaedza kakawanda kutora nzvimbo yose yeDarjeeling. Pakutanga kwezana ramakore rechi 19, vakanga vapinda muSikkim nechokumabvazuva kusvikira kuRwizi Teesta uye vakanga vakunda ndokupinza Terai uye nharaunda yose zvino yakanga yava yeNepal. Munguvayi, Hondo yeBritain yakanga iri mubasa rokudzivisa maGurkha kupinda mumuganhu wose wokuchamhembe. Nhamba
Hondo yeAnglo-Nepalese yakatanga muna 1814, iyo yakaguma nekukundwa kweGurkhas uye yakazotungamira kusainwa kweSugauli Treaty muna 1816. Maererano nechibvumirano chacho, Nepal yaifanira kubvisa nzvimbo dzose dzakanga dzatorwa kubva kuChogyal yeSikkim kuenda kuBritish East India Company (kureva nzvimbo iri pakati peRwizi rweMechi neRwizi rweTeesta). Gare gare muna 1817, kuburikidza neChibvumirano cheTitalia, British East India Company yakadzorera Chogyal weSikkim, yakadzorera nzvimbo dzose dzenyika pakati peRwizi Mechi neRwizi Teesta kuChogyal weSikkim uye yakavimbisa hutongi hwake.