On 17 September Wołkowicki's division became part of Lublin Army and it moved from Chełm to the area of Hrubieszów. Soon afterwards, the unit took part in the Battle of Tomaszów Lubelski, fighting the German 28th Jäger Division and 2nd Panzer Division. After the defeat, Wołkowicki, together with some 300 soldiers, tried to escape to the east, but on 28 September was caught by Red Army troops that had invaded Poland on 17 September.