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Regarding the confusion between Kadan and Kaidu, here is an excerpt from Chambers' book The Devil's Horsemen. "Nevertheless, several serious histories of central Europe still refer to Liegnitz as a Polish victory, and the most widespread misunderstanding, caused by the use of nicknames and the awesome difficulty encountered in translating oriental characters, has managed to survive into the majority of general history books today. Kadan was mistranslated as Kaidu, and it is therefore said that Ogedei's grandson Kaidu, and not his son Kadan, who partnered Baidar in Poland in 1241. Quite apart form the obscurity of the manuscripts this is impossible since it is known that Kaidu was born in 1230 and ten-year-old boys did not command Mongol armies" (pp. 100-101). Olessi 02:10, 6 October 2006 (UTC)
This site  tells that one of the leaders of the first mongol attack against Poland, alongside with Baidar and Orda Khan, was a Chagatai's son named Qaidan. And that the Ogodei's son Kadan was one of the commanders of the mongol forces in Transylvania. I think that this sites solves the mistery about this.
Hi! Chagatai's son Baidar attented the campaign. He did not have a son called Kadan. Please read Rashid Ad-din or Gumilev.L.N.. I think that it was mistake. user: Enerelt —Preceding comment was added at 10:49, 27 May 2008 (UTC)
No - unless you are an historian with much experience with the history of the Mongol empire, using primary sources can get you into problems, as they often have false or mistaken information in them. They must be balanced with other writings and archaeological findings to arrive at the proper conclusions - which Chamber's The Devil's Horsemen does (it's THE best general source in any language for the Mongol expeditions into Europe, a watershed work.) HammerFilmFan (talk) 21:58, 1 October 2012 (UTC)