Although Polish forces under hetman Stefan Czarniecki dealt defeat to Russian forces at the battle of Polonka, and recaptured Wilno in 1660, lack of other Commonwealth military successes, especially in Ukraine, further undermined Cossack support of the Commonwealth. Vyhovsky's early success at the battle of Konotop in June 1659 was not decisive enough, and was followed by a series of defeats. The Russian garrisons in Ukraine continued to hold out; a Zaporozhian attack on the Crimea forced Vyhovsky's Tatar allies to return home, and unrest broke out in the Poltava region.