Polish occupation of Moscow

The combined Russian and Swedish forces were defeated on 4 July 1610 at the battle of Klushino (Kłuszyn), where 5,000 Polish elite cavalry, the hussars under hetman Stanisław Żółkiewski, defeated the numerically superior Russian army of about 35,000--40,000 soldiers. This giant and surprising defeat of the Russian forces shocked everyone and initiated the Polish occupation of Moscow.