Shortly after the defeat in the Battle of Warsaw, the withdrawing Red Army handed Vilnius over to Lithuania, in accordance with the agreement.
He managed to withdraw his unit under heavy pressure from numerically-superior enemy and regroup it, only to take part in the Battle of Warsaw in mid-August.
Swierzinski died on the 29 October 1944 from wounds received the previous day during the Battle of Warsaw.
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After the Battle of Warsaw he remained in the city, was arrested by the Russians and sentenced to forcible resettlement to Perm.
In 1920 the Viscount D'Abernon published The Eighteenth Decisive Battle of the World: Warsaw, 1920, in which he claimed that the next battle on the list was the battle of Warsaw, fought in 1920 by the Polish and Bolshevik forces during the Polish-Bolshevik War.
The regiment took active part in many battles of the November Uprising, notably in the Battle of Ostrołęka, fights in Lithuania and the final battle of Warsaw.