A disastrous land invasion of British India by these people was averted by the Pahlen Plot. Baturyn was sacked after a leader of these people switched sides to join Charles XII of Sweden at Poltava. (20[4])Anger over (20[1])fishing rights contributed to a rebellion led by the Yaik subgroup of these people. Under the “stanitsa democracy” practiced by these people, widespread bribery occurred in races to be elected (*) Hetman. A vulgar letter sent to Mehmed IV by some of these people is the subject of Ilya Repin’s painting Reply of the Zaporozhians. Ivan Mazepa and Yemelyan Pugachev led rebellions of these people who settled along the Don. For 10 points, name this nomadic people from the Ukrainian steppe that formed the cavalry of the Russian Empire. ■END■