What big mistake did Napoleon see in his campaign?

The biggest mistake in Napoleon’s actions was organizing a campaign against Russia. Even during training, the French commander strongly doubted many key issues. However, he hoped that the Russian sovereign Alexander would be frightened by the great army of France at that time and would himself make concessions, but this did not happen.

Napoleon hoped that the war would end quickly and that all important battles would take place on the border of the state. However, things didn’t go according to plan. The Russian sovereign did not give in and the great Russian commanders turned out to be masters of military affairs.