It didn’t seem likely that Kutuzov’s 40,000 soldiers could sneak off in another direction without being noticed by Napoleon. I concluded that Napoleon wasn’t really so much more perspicacious than Murat, he just had access to more reconnaissance information.
(Bonaparte quoted by Virilio: Napoleon expresses it clearly: “Aptitude
for war is aptitude for movement,” and he specifies that one must
evaluate the strength of the army “as in mechanics, by its mass
multiplied by its speed.” )