Original sentence: During the Lithuanian Civil War (1389–1392) Karigaila commanded defense of the Crooked Castle in Vilnius.He is sometimes mistaken with his brother Constantine, who gave rise to the House of Czartoryski.He ruled Mstsislaw after it was captured from the Principality of Smolensk.He then hurried from Poland to eastern Grand Duchy of Lithuania to subdue his half-brother Andrei of Polotsk, who renewed his struggle for power against Jogaila.Karigaila (, died on September 16 1390 in Vilnius) was one of the sons of Algirdas, Grand Duke of Lithuania, and his second wife Uliana of Tver.Karigaila is buried at Vilnius Cathedral.Later Jogaila complained that Karigaila was taken captive and brutally executed by the Teutonic Knights; the Knights denied and claimed that Karigaila was killed in the fight and they only found his body.On April 18 1386 he and his other brother soundly defeated Sviatoslav of Smolensk, who allied himself with Andrei and attacked Mstsislaw, in the Battle of the Vekhra River
Edited sentence: During the Lithuanian Civil War (1389–1392) Karigaila commanded the defense of the Crooked Castle in Vilnius.He became the ruler of Mstsislaw after he captured it from the Principality of Smolensk.He is sometimes mistaken for his brother Constantine, who was the founder of the House of Czartoryski.He then left Poland for the eastern part of the Grand Duchy of Lithuania in order to subdue his half-brother Andrei of Polotsk, who had renewed his struggle for power against Jogaila.His brother, Jogaila, now king of Poland, charged that Karigaila was taken captive and brutally executed by the Teutonic Knights; the Knights denied this and claimed that Karigaila was killed during the battle.Karigaila (, died on September 16 1390 in Vilnius) was a son of Algirdas, Grand Duke of Lithuania, and his second wife Uliana of Tver.Karigaila was buried at Vilnius Cathedral.On April 18 1386 he and his other brother soundly defeated Sviatoslav of Smolensk, who had allied himself with Andrei and attacked Mstsislaw, during the Battle of the Vekhra River