Mid-August to October 1659 were unfavorable for Ukraine. The political reorientation of most officers to Muscovy (the oath to the tsar and the call of the Muscovite army) due to their dissatisfaction with the version of the Treaty of Hadiach ratified by the Sejm of the Polish–Lithuanian Commonwealth superseded the Ukrainian army's military achievements. In September, Yurii Khmelnytsky replaced Vyhovsky as hetman and the Ukrainian Ruin began.
