On 4 May 1648, near Kamianyi Zaton, Mykhailo Krychevsky's 3,500 registered Cossacks mutinied, killing all the officers (Krychevsky himself was taken prisoner and would join Khmelnytsky's army). Cossacks who stayed loyal to the Crown Army, such as Ivan Barabash, were cut down, as well as the German dragoons in their midst.
In May 1648, near Kamianyi Zaton, a group of 3,500 Cossacks led by Mykhailo Krychevsky rose up against the officers (Krychevsky was taken prisoner and later joined Khmelnytsky's forces). The remaining loyal Cossacks who stayed with the Crown Army were killed, along with German dragoons in their ranks.