Muscovite–Lithuanian Wars
15th century: strengthening Moscow

Conflicts resumed during the reign of Dmitry's son Vasily I, who was married to Sophia, the sole daughter of the Lithuanian Grand Duke Vytautas the Great. In 1394, Vytautas devastated the Principality of Ryazan, leaving many settlements in ashes. In 1402, he quarrelled with his son-in-law over control of the Principality of Smolensk. After Vytautas captured his capital, Yury of Smolensk fled to Vasily's court and tried to enlist his assistance in regaining Smolensk. Vasily hesitated until Vytautas advanced on Pskov. Alarmed by Lithuania's continuing expansion, Vasily sent an army to aid the Pskovians against his father-in-law. The Russian and Lithuanian armies met near the Ugra River, but neither commander ventured to commit his troops to battle. A peace ensued, whereby Vytautas kept Smolensk.
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