What was the major reason for napoleons defeat while trying to invade russia in 1812

The cold weather was very harsh that year.  Since Napoleon's troops weren't prepared for the bitter cold, they were forced into retreat.  This was the French Army's first major defeat under Napoleon.  In about 130 years, Adolf Hitler's troops committed the same mistakes and had to retreat, too.

It's lithogenous i believe of course i looked it up.