Louis Antoine Fauvelet de Bourrienne, Memoirs of Napoleon Bonaparte…
“ Poniatowaki retired to his estate year Warsaw, where he lived like a private gentleman until the creation of the Grand Duchy of Warsaw revived the hopes of the Polish patriots. He then became War Minister. The Archduke Ferdinand having come, in 1809, with Austrian troops to take possession of the Duchy of Warsaw, Poniatowski, who commanded the Polish troops, which were very inferior in numbers to the Austrian force, obliged the latter, rather by dint of skillful maneuvering than by fighting, to evacuate the Grand Duchy. ”
