Švitrigaila commanded a force of about 11,000 men: Lithuanians and Orthodox Ruthenians from Polotsk, Vitebsk, Smolensk, Kiev, Volhynia, Livonian Knights and their merceneries, at least 500 Tatars from the Golden Horde, and a few Teutonic Knights [REF].
Švitrigaila gathered his forces in Vitebsk and marched towards Braslaw where he joined with the Livonian forces on August 20 [REF].