Anglo-Nepalese War
The relationship between two only began in the 18th century when the Qing dynasty expanded near the Nepalese border, but this resulted in war between two nations, at the time concentrated mostly in Tibet. After the war, Nepal and China signed a peace treaty, which made Nepal a vassal of China; but with the Anglo-Nepalese War and China's failure to assist Nepal resulted in the domination of Nepal by Britain. Nepal contributed Gorkha troops to serve under the British during the First and Second Opium Wars.