The Mongols sent two Tumens into Poland in a flank effort to insure that the Poles would not be able to reinforce the Hungarians. This effort was to insure that the Europeans would not be able to concentrate their forces. At the time -Hungary was one of the most powerful states in Europe.. and what happened net.... would change that.
My Slovak aborn 75 year old Godfather had and asian-looking cousin in his family so the genetics of the Mongols pops up every once in awhile in European offspring.