They weren’t Tartars. They were MONGOLS...led by, I believe, Kadaan Quan, one of Chagatai’s sons, and Buri Quan, brother of Batu, the Quan whose ulus were being expanded to the West. And the attack on Poland was a subsidiary operation to the main attack- against Hungary, led by Batu, Mongke [son of Tolui], and the greatest general in history...Sabotai Bahadur.