who formed a barrier between the feudal agriculture of Poland and Hungary to the west and the Tartar to the east. The Cossacks were the wild east of Europe, and in many ways not unlike the wild west of the United States in the middle nineteenth century. All who had made Russia too hot to hold them, criminals as well as the persecuted innocent, rebellious serfs, religious sectaries, thieves, vagabonds, murderers, sought asylum in the southern steppes, and there made a fresh start and fought for life and freedom against Pole, Russian, and Tartar alike. Doubtless fugitives from the Tartars to the east also contributed to the Cossack mixture. Chief among these new nomad tribes were the Ukraine Cossacks on the Dnieper and the Don Cossacks on the