The Czechs produced two full banners, under the command of Jan Sokol z Lamberka (cz).[4] Serving among the Czechs was possibly Jan Žižka, future commander of the Hussite forces.[43] Alexander the Good, ruler of Moldavia, commanded an expeditionary corps.[2] Vytautas gathered troops from Lithuanian, Ruthenian (modern Belarus and Ukraine) and Russian lands. The three Russian banners from Smolensk were under the command of Władysław II Jagiełło's brother Lengvenis, while the contingent of Tatars of the Golden Horde was under the command of the future Khan Jalal ad-Din.[3] The overall commander of the joint Polish–Lithuanian force was King Władysław II Jagiełło; however, he did not directly participate in the battle. The Lithuanian units were commanded directly by Grand Duke Vytautas, who was second in command, and helped design the grand strategy of the campaign.