Battle of Eylau
In 1806, Jomini published his views as to the conduct of the impending war with Prussia. That, along with his knowledge of Frederick the Great's campaigns, which Jomini had described in the "Traité", led Napoleon to attach him to his own headquarters. Jomini was present with Napoleon at the Battle of Jena and at the Battle of Eylau, where he won the cross of the Legion of Honour.