 At the start of the Russo-Lithuanian war of 1500–1503, Lithuanians suffered a major defeat in the Battle of Vedrosha.Great Hetman (army commander) Konstanty Ostrogski was captured and was replaced by Semyon Olshanski who had gained military experience during the Polish–Ottoman War (1485–1503).But Olshanski was quickly replaced by Kęsgaila who had no prior military experience.