However, the first army failed to acquire the Dalai Lama, having been defeated by Qing troops at Kumbum. Dzungar troops went on the rampage through Lhasa and its environs, looting, raping and killing. Soon, the Tibetans were appealing to the Kangxi Emperor to rid them of the Dzungars. The Dzungar occupation of Tibet became more difficult to sustain as time passed and though they managed to defeat a poorly organized Chinese invasion at the Battle of the Salween River in 1718, Qing troops took Lhasa in 1720 during their second and larger expedition.