Sigismund Kęstutaitis
Švitrigaila commanded a force of about 11,000 men: Lithuanians and Orthodox Ruthenians from Polotsk, Vitebsk, Smolensk, Kiev, Volhynia, Livonian Knights and their mercenaries, at least 500 Tatars from the Golden Horde, and a few Teutonic Knights. There might have been some Hussites on his side as he enlisted his nephew Sigismund Korybut, a distinguished military leader during the Hussite Wars. Forces of Sigismund Kęstutaitis were probably smaller. His son Michael commanded Lithuanian troops from Samogitia, Podlaskie, Hrodna, Minsk, and Jakub Kobylański was in charge of Polish forces (4,000 troops).