Kozlov was the commander of the barrier company charged with summarily executing all soldiers who deserted the battlefield. On 18 September 1942, the Soviets were making a push to recapture Red Square from its German defenders. The first wave failed, forced to retreat after meeting stiff resistance from the German line. Kozlov ordered the deaths of the deserters from the first wave, and initiated the second wave. The second wave after a flanking action carried out by Sergeant Makarov and Alexei Voronin was successful, ending the assault.
Kozlov will fire on the player if he retreats past the barricade ahead of their position.