The Mongol invasion of Europe in the 13th century was the military effort by an Asian power, the Mongols, to invade and conquer Europe. It involved the severe and rampant destruction of East Slavic principalities and major cities, such as Kiev and Vladimir. Mongol invasions also affected Central Europe, warring with the Kingdom of Hungary (in the Battle of Mohi) and causing the fragmentation of Poland (in the Battle of Legnica).