He then campaigned against the Volga Tatars .
He then defeated khan Balaklay in the battle of Kojdanow ( modern Dzyarzhynsk , Belarus ) , which allowed Shvarn to capture the towns of Mozyr , Chernigov , Karachev and Starodub .
He then campaigned against the Volga Tatars and defeated khan Balaklay in the battle of Kojdanow ( modern Dzyarzhynsk , Belarus ) , which allowed Shvarn to capture the towns of Mozyr , Chernigov , Karachev and Starodub .