aide-de-camp alexander i of russia artillery battle of arcis-sur-aube battle of bar-sur-aube battle of brienne battle of craonne battle of dennewitz battle of dresden battle of hanau battle of katzbach battle of kulm battle of laon battle of leipzig battle of montereau battle of montmartre battle of mormans battle of saint-dizier battle of sehested bautzen first french empire frederick william iii of prussia geraud duroc imperial guard kingdom of prussia marshal of france michel ney napoleon i of france peter wittgenstein pyrrhic victory russian empire saxony six days campaign tsar war of the sixth coalition