Catherine, a laundress, makes the acquaintance of François Lefebvre, a young sergeant and promises to join him after the revolution. Finally, she can wait no longer and joins him on the battlefield. The couple are caught by the Austrians, but escape after having destroyed the enemy's arsenal. François is promoted to the rank of Colonel, then to Marshal by Napoleon. However, Catherine's offhandedness is frowned on at the Imperial Court. Napoleon orders François to choose another woman if he is to advance his career...