The year was 1241 AD. The Mongols have created the largest empire in the World. Batu Khan, son of Ögödei (and grandson of the already deceased Gengis Khan) is leading the Mongol advance.
Most of Poland, Bohemia, Hungary and the Danube valley is under Batu’s complete control, when the news reach him that his father Ögödei has died. He essentially packs up and heads home to Mongolia to make sure he can ascend to the throne, which he failed to accomplish. It is possible that if Batu had stayed in Europe, he could have conquered the entire continent. The Mongols did go back to Europe, but were not able to finish the job.
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By Postmann Michael de Wikipedia en alemán (Transferido desde de.wikipedia a Commons.) [Public domain], undefined