 Complete the following phrase:  In 1386, Prince was killed in the Battle of the Vikhra River against the Lithuanians when he supported Andrei of Polotsk and his rebellion against his younger half-brother Jogaila. However, Skirgaila, who commanded the Lithuanians in battle, was married to Sviatoslavs niece and allowed Yury of Smolensk to succeed his father. In 1395, Grand Duke Vytautas of Lithuania took Smolensk and installed his governor there. Four years later, Vytautas was routed by the Tatars in the 