The Crown had never before put such a large regular army in the field. The regular Polish army was commanded by Janusz Świerczowski, while the private Polish detachments and household troops were under the command of Wojciech Sempoliński. The Lithuanian landed service (some 15,000 soldiers) was led by Grand Hetman Konstanty Ostrogski and Field Hetman Jerzy Radziwiłł. The Lithuanian-Polish forces included 32,500 cavalry and 3,000 mercenary infantry. Sigismund left 4,000–5,000 men in the town of Barysau, while the main force, placed under the command of Hetman Konstanty Ostrogski and around 30,000 strong, moved on to face the Muscovites.