"Our situation is unparalleled. If Napoleon extricates himself today, then he must have the Devil in him" - Marshal Ney, during the Battle of the Berezina.
Superhuman ability only comes out in the most trying and impossible of circumstances.
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Also, the standard history lesson of "never start a war with Russia that you aren't willing to turn into a war of existence" applies.
The Slavic way of fighting war is to fight as if you are fighting a war of extermination, ala the Mongols.
You fight to conquer, totally. If not, then you might as well not fight at all.
