Polish–Russian War (1609–1618)
1605–1618 sequence of military conflicts and eastward invasions
The Polish–Russian War was a conflict fought between the Polish–Lithuanian Commonwealth and the Tsardom of Russia from 1609 to 1618.
Russia had been experiencing the Time of Troubles since the death of Tsar Feodor I in 1598, which caused political instability and a violent succession crisis upon the extinction of the Rurik dynasty; furthermore, a major famine ravaged the country from 1601 to 1603. Poland exploited Russia's civil wars when powerful members of the Polish szlachta began influencing Russian boyars and supporting successive pretenders to the title of tsar of Russia against the crowned tsars Boris Godunov (r. 1598–1605) and Vasili IV Shuysky (r. 1606–1610).
From 1605, Polish nobles conducted a series of skirmishes until the death of False Dmitry I in 1606, and they invaded again in 1607 until Russia formed a military alliance with Sweden two years later. The King of Poland, Sigismund III Vasa, declared war on Russia in response in 1609, aiming to gain territorial concessions and to weaken Sweden's ally. Polish forces won many early victories such as the 1610 Battle of Klushino. In 1610, Polish units entered Moscow and Sweden withdrew from the military alliance with Russia, instead triggering the Ingrian War of 1610-1617 between Sweden and Russia.
Sigismund's son, Prince Władysław of Poland, was elected tsar of Russia by the Seven Boyars in September 1610, but Sigismund refused to allow his son to become the new tsar unless the Muscovites agreed to convert from Eastern Orthodoxy to Catholicism, and the pro-Polish boyars ended their support for the Polish–Lithuanian Commonwealth. In 1611, Kuzma Minin and Prince Dmitry Pozharsky formed a new army to launch a popular revolt against the Polish occupation. The Poles captured Smolensk in June 1611, but began to retreat after they were ousted from Moscow in September 1612.
“Polish–Russian War (1609–1618)” enters the record as 1605–1618 sequence of military conflicts and eastward invasions. Crown Archives preserves that source wording while asking what Polish, Russian and sequence can confirm, complicate or overturn.
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The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Aug 29, 2026. The linked authority identifier is Q1044829. The Library of Congress control number is sh2007005735. Authority coordinates are 50.050, 19.930. 2 of 2 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1609, 1618, 1598 and 1601.
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