The 11th then fought against Polish troops in the area of Lake Ssho, Kamen, and Ushachy, and in the May Offensive. The division fought in the July Offensive during the Polish–Soviet War between 4 and 23 July and then in the Battle of Warsaw, fighting in the area of the Narew and the Vistula, retreating into Belarus after the Red defeat in the Battle of Warsaw. The 15th Army was disbanded in December and the division joined the Petrograd Military District. It fought in the suppression of the Kronstadt rebellion in March 1921 as part of the 7th Army.