The commander-in-chief of this polity's army is the subject of a memorial designed by Bertel Thorvaldsen. This polity's army defeated General Pahlen at the Battle of Zedtiltz, and had earlier won the Battle of Raszyn as part of an invasion of Austria. Nominally led by Frederich Augustus I of Saxony, this polity was created by an agreement signed in the Nemen River on a raft by France and Russia, the 1806 Treaty of Tilsit. After its demise, most of this polity was given to Russia, which turned it into the "Congress Kingdom." For 10 points, name 
The commander-in-chief of this polity's army is the subject of a memorial designed by Bertel Thorvaldsen. This polity's army defeated General Pahlen at the Battle of Zedtiltz, and had earlier won the Battle of Raszyn as part of an invasion of Austria. Nominally led by Frederich Augustus I of Saxony, this polity was created by an agreement signed in the Nemen River on a raft by France and Russia, the 1806 Treaty of Tilsit. After its demise, most of this polity was given to Russia, which turned it into the "Congress Kingdom." For 10 points, name this Napoleonic puppet state centered on the capital of Poland.
The commander-in-chief of this polity's army is the subject of a memorial designed by Bertel Thorvaldsen.
Grand Duchy of Warsaw [or Ksiestwo Warszawskie; or Duche de Varsovie; or Herzogtum Warschau; or Varshavskoi Gerchogstv; prompt on Poland before Nemen is read and don't accept it after]