At this tune , too , he became intendant-general of the military household of Napoleon . In the campaigns of 1806 – 1807 , Daru served , in his usual capacity , in the army which overthrew the forces of Russia and Prussia ; and he had a share in drawing up the Treaty of Tilsit ( 7 July 1807 ) . After this he supervised the administrative and financial duties in connection with the French army which occupied the principal fortresses of Prussia , and was one of the chief agents through whom Napoleon pressed hard on that land . At the Congress of Erfurt , Daru had the privilege of being present at the interview between Johann Wolfgang von Goethe and Napoleon , and interposed tactful references to the works of the great poet
Congress of Erfurt
Congress of Erfurt
Pierre, comte Daru