 In 1518, Russian forces were beaten during the siege of Polotsk, when according to legend the Lithuanian forces were inspired by the sight of their patron saint, Saint Casimir.The Russians invaded Lithuania again in 1519, raiding Orsha, Mogilev, Minsk, Vitebsk, and Polotsk.By 1521, Sigismund had defeated the grand master and allied with the Kazan and Crimean Tatar hordes against Moscow.