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The Outer Khalkha Mongols had preserved their independence, and only paid tribute to the Qing Empire. However, a conflict between the houses of Tümen Jasagtu Khan and Tösheetü Khan led to a dispute between the Khalkha and the Dzungars over the influence of Tibetan Buddhism. In 1688, the Dzungar chief, Galdan Boshugtu Khan, attacked the Khalkha from the west and invaded their territory. The Khalkha royal families and the first Jebtsundamba Khutuktu crossed the Gobi Desert and sought help from the Qing Empire in return for submission to Qing authority. In 1690, the Dzungars and Qing forces clashed at the Battle of Ulan Butung in Inner Mongolia, in which the Qing eventually emerged as the victor.