This sounds like Jena to me. Obviously, Napoleon passed the night before the battle in his tent among a battalion of his Guard, and the battle featured both Ney and Murat in the roles described. But it was on 14 October and I can't link it to the 6th other than by the rather obvious fact that the campaign began on that day. Maybe someone else can think of something ...
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D.S. "Green Horse" Walter, Maréchal d'Empire
Duc des Pyramides, Comte de Normandie
Commandant la [url="http://home.arcor.de/dierk_Walter/NWC/3_VI_AdR_Home.htm"]3e Division Bavaroise[/url], L'Armée du Rhin
Commandant [url="http://home.arcor.de/dierk_Walter/NWC/EdM_start.htm"]L'Ecole de Mars[/url], L'Armée du Rhin
Commandant des Grenadiers à Pied de la Vieille Garde, "les Grognards"

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