看到赛马娘世界有长城想到的，有长城那就有蒙古人 有蒙古人就有成吉思汗 有成吉思汗那么赛马娘古代成吉思汗就会和一匹（其实是三匹）马打爆了大半个欧亚

I thought of this when I see the Great Wall of China exists in Umamusume's world. If there's the Great Wall, then there's Mongolians; if there's Mongolians, then there's Genghis Khan; if there's Genghis Khan, then in the past, Genghis Khan would be defeating most of Eurasia with a horse girl (actually 3).