Batu, Kahn of the Golden Horde (Russia), invaded Europe in 1241. He sacked [[Krakow]] and defeated the Polish army, but the death of Ogedei in Asia caused him to retreat since all Mongols traditionally needed to be personally present at the election of a new Kahn. <ref>''The Collected What If? Eminent Historians Imagine What Might Have Been.'' Ed. Robert Cowley.</ref> To this day, Poland continues to celebrate the battle, claiming it as a strategic victory because the Mongols retreated.
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Batu, Kahn of the Golden Horde (Russia), invaded Europe in 1241. He sacked [[Kraków]] and defeated the Polish army, but the death of Ogedei in Asia caused him to retreat since all Mongols traditionally needed to be personally present at the election of a new Kahn. <ref>''The Collected What If? Eminent Historians Imagine What Might Have Been.'' Ed. Robert Cowley.</ref> To this day, Poland continues to celebrate the battle, claiming it as a strategic victory because the Mongols retreated.