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One thing you get from his depiction, which you don't get in the linked article, is an up-close sense of what the Mongol invasion felt like "from the inside" at the ground level, rather than the dispassionate view of "expanding trade" and being "egalitarian." He emphasizes the impressiveness (if you want to call it that) of the sheer scale of killings, done in a systematic way that would be notable in the modern era but even more so when you realize that it wasn't done with guns or gas chambers or industrialized tools, but by hand.