The Prussian commitment to the campaign in Russia is half-hearted at most. Prussia learned from it and is now ready to once again rise to glory and power. The military catastrophe of 1806 was a bitter lesson for the Prussian military, and the Prussian state overall, but a bitter lesson is still a lesson.
In 1812 the once mighty Prussia has been conquered and is now, forcibly, allied to the French. The glory and power of Prussia is a thing of the past, not the present. Prussia, or Königreich Preußen, is a nation in the Mount&Blade: Warband downloadable content, Napoleonic Wars.