Early in the morning of the 5th, Napoleon reached Smorgoni. Here, at seven in the evening, he held his last conference with his marshas. Murat, Eugene, Berthier, Lefebvre, Bessieres, Mortier, Ney and Davout were summoned to attend. The Emperor came straight to the point. he had decided that the time had come for him to leave the army and return to Paris. The Emperor gave out that he would be accompanied back to France by only Caulaincourt, Duroc, Lobau, his valet Roustam and a Polish interpreter, together with a small escort of Neapolitan cavalry. The convoy would consist of only three vehicles, a sleeping coach and two caleches. The Empoeror would be traveling incognito, posing as Caulaincourt's first secretary. The news of his departure was to be kept secret for several days, but then an Imperial decree was to be promulgated announcing the necessary changes of command - "Article One: The King of Naples is nominated lieutenant-general and will command the Grande Armee in our absence." - and that the Emperor was heading for Warsaw. His aides were to follow from day to day in rota, carrying the latest tidings.
Murat is left in command
~ D. Chandler, The Campaigns of Napoleon, p. 848-849