The Battle of the Salween River was fought in September 1718 close to the Nagqu in Tibet, between an expedition of the Qing dynasty to Lhasa and a Dzungar Khanate force that blocked its path. After Tsering Dhondup conquered Tibet in 1717 on the orders of his cousin, the Dzungar Khong Tayiji Tsewang Rabtan, the Qing Kangxi Emperor ordered his generals to muster an army and expel the Dzungars and their supporters from Tibet but the enormous distances and logistical difficulties prevented an immediate reaction. Wikipedia