family and was sympathetic to some of the rebels' arguments. In the battle of Guzów he commanded the left flank of the royal forces, but his troops took relatively little part in the battle. Unimpressed with Żółkiewski's performance, the king did not give him not the Grand Crown Hetmanship that he coveted, although he was appointed to the office of the voivode of Kiev. In the second half of 1609, Żółkiewski took part in the Polish–Muscovite War (also known as the Dymitriads). He supported the election of Władysław IV Vasa for the tsar of Russia and the idea of a personal union between the Commonwealth and the Tsardom of Russia (the Polish–Muscovite Union). During the De la Gardie Campaign in 1610 he achieved another significant victory against combined Russian and Swedish forces at the battle of Klushino. As a result of his successful campaign Żółkiewski seized Moscow and captured the tsar Vasiliy Shuisky and his brothers, Ivan Shuisky and Dmitry Shuisky. Sigismund rejected Żółkiewski's political plan however, which would have required Władysław to convert to Orthodoxy. Żółkiewski began to write his memoirs after his return from Muscovy. The Początek i progres wojny moskiewskiej (The beginning and Progress of the Muscovy War), published in 1612, is a critique of Zygmunt's policies. In 1612 he became a teacher and tutor of Stanisław Koniecpolski, future hetman and military commander. Also that year he returned to Ukraine to defend against continuing Tatar and Moldovan incursions, as well as Cossack unrest. In 1616 during a Sejm he presented a project O chowaniu żołnierza kwarcianego (On the raising of the kwarciane soldiers), in which he argued for the need to raise a larger army to deal with the Tatars and the Cossacks. The project was however not approved by the parliament. Final years Żółkiewski's popularity waned in the latter years of his career. He was accused of not supporting Samuel Korecki during the battle of Sasowy Róg in 1616, of signing the Treaty of Jaruga (Busza) in 1617 which relinquished influence in some borderlands to Moldova and the Ottoman Empire; and of failing to stop the Tatars at the battle of Orynin in 1618. But in 1618 he finally received his coveted buława of the Grand Crown Hetman, and shortly afterwards the office of Grand Crown Chancellor. He was thus for a brief period the most powerful individual in the Commonwealth after the king, a position