What was one of the reasons for the defeat of Napoleon’s army in Russia in 1812?

One of the reasons for the defeat of Napoleon’s army was that the French emperor hoped for a quick victory, but this did not happen, and therefore, the troops were exhausted by the military campaign, which became the cause of desertion, disease and hunger. We can say that a catastrophe occurred, which entailed the defeat of Napoleon’s army. The accompanying factors include: the action of partisan detachments, a sharp cold snap, hunger, etc.