Start of the Anglo-Tibetan War of 1888.
The Sikkim expedition (Chinese: 隆吐山戰役; pinyin: Lóng tǔshān zhànyì; lit. 'Battle of the Lingtu Mountain') was an 1888 British military expedition to expel Tibetan forces from Sikkim in present-day northeast India. The roots of the conflict lay in British-Tibetan competition for suzerainty over Sikkim.