(en) Melvyn C. Goldstein, The Snow Lion and the Dragon, chapter The Imperial Era, p. 14 : « the emperor saw Tibet as an important buffer for western China (Sichuan, Gansu, and Yunnan) and was unwilling to allow it to remain in the control of his enemy, the Dzungars.[8] Consequently, he ordered a second, larger army into Tibet, sending the young seventh Dalai Lama with them. [...] This time the Dzungars were defeated, and in October 1720 the Qing army entered Lhasa with the new seventh Dalai Lama ».
