Kutuzov's genius of repeatedly pulling back until the Grande Armee was standing at the doorstep of their ancient capital, fighting one of the most stubborn battles in the Napoleonic era, yet loosing significantly more men than their attackers, and finally backing off, to behind their capital, allowing it to be plundered and burnt down during the occupation? (The city didn't burn down in a day, but a series of fires occurred almost every day until the Grande Armee left). Even when the attackers were retreating, he was still indecisive.
