Answer:
Napoleon failed to conquer Russia in 1812 for several reasons: faulty logistics, poor discipline, disease, and not the least, the weather.To do this Napoleon would advance his army along several avenues and converging them only when necessary. The slowest part of any army at the time was the supply trains.
He transformed the way in which the French army operated and turned France into the greatest military power in Europe. His confidence and ambition inspired his troops, and their victories brought glory to France. Napoleon saved France from the chaos of the French Revolution.