In the Finnish war he also managed to distinguish himself. He had picked up the scrap of a grenade that had killed an aide-de-camp standing near the commander in chief and had taken it to his commander. Just as he had done after Austerlitz, he related this occurrence at such length and so insistently that everyone again believed it had been necessary to do this, and he received two decorations for the Finnish war also. In 1809 he was a captain in the Guards, wore medals, and held some special lucrative posts in Petersburg.
Though some skeptics smiled when told of Berg's merits, it could not be denied that he was a painstaking and brave officer, on excellent terms with his superiors, and a moral young man with a brilliant career before him and an assured position in society.