Best I can give you on this one is info from a quick search on the matter:

The next day Oudinot set off with just his aides to return to France as quickly as possible to recover. As they were resting at a small cottage, a group of Cossacks surrounded the cottage and demanded their surrender. Oudinot stood up, reached for his pistols, and stated, "If they take me alive at least they will see who I am." He led his men in the defense of the cottage, and upon hearing the sound of battle, some French cavalry rode to the scene to assist in driving off the Cossacks. Oudinot again did not escape wounding, as just as the Cossacks began to flee, one of their shots hit the ceiling of the cottage, causing a beam to fall and hit Oudinot in the head.

https://www.frenchempire.net/biographies/oudinot/