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Some scholars estimate that about 80% of the Dzungar (Western Mongol) population (600,000 or more) were destroyed by a combination of warfare and disease in the Dzungar genocide during the Qing conquest of Dzungar Khanate in 1755–1757, in which Manchu Bannermen and Khalkha Mongols exterminated the Dzungar Oirat Mongols. Mark Levene, a historian whose recent research interests focus on genocide, has stated that the extermination of the Dzungars was "arguably the eighteenth-century genocide par excellence."