What had begun as a rebellion of Russian Cossacks begins to turn into a full-scale war against the Polish nobility, when a rebel army almost 10 000 strong defeats the Poles at the Battle of Zhovti Vody in modern-day Ukraine.
Editors. "Cossacks defeat the Poles". The Literary Encyclopedia. First published 01 April 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=17623, accessed 02 March 2015.]