By April 1648 word of an uprising had spread throughout the Commonwealth. Either because they underestimated the size of the uprising, or because they wanted to act quickly to prevent it from spreading, the Commonwealth's Grand Crown Hetman Mikołaj Potocki and Field Crown Hetman Marcin Kalinowski sent 3,000 soldiers under the command of Potocki's son, Stefan, towards Khmelnytsky without waiting to gather additional forces from Prince Jeremi Wiśniowiecki. Khmelnytsky marshalled his forces and met his enemy at the Battle of Zhovti Vody, which saw a considerable amount of defections on the field of battle by registered Cossacks, who changed their allegiance from the Commonwealth to Khmelnytsky. The victory was quickly followed by rout of the Commonwealth's armies at the Battle of Korsun, which saw both the elder Potocki and Kalinowski captured and imprisoned by the Tatars.