In November 1800, Fichte published "The Closed Commercial State: A Philosophical Sketch as an Appendix to the Doctrine of Right and an Example of a Future Politics" ("Der geschlossene Handelsstaat. Ein philosophischer Entwurf als Anhang zur Rechtslehre und Probe einer künftig zu liefernden Politik"), a philosophical statement of his property theory, a historical analysis of European economic relations, and a political proposal for reforming them. In 1805, he was appointed to a professorship at the University of Erlangen. The Battle of Jena-Auerstedt in 1806, in which Napoleon completely crushed the Prussian army, drove him to Königsberg for a time, but he returned to Berlin in 1807 and continued his literary activity.