The retreat was gruesome. During it, Napoleon reached his nadir as a soldier, but somewhere, possibly during one of the running fights with Cossacks or other Russian irregulars, he regained his identity and courage, and got the remnants of his army out of Russia, the survivors he later proudly nicknamed his 'men of bronze.'
Without a doubt, the French and allied survivors were the toughest men in the Grande Armee by virtue of their getting out of Russia. The best and proudest moment for all concerned, except the Russians of course, was the assault crossing of the Berezina River, the last obstacle facing the Grande Armee on its way home.
Chased by two, and the river line held by another Russian army, the professionalism and stark fighting qualities of Napoleon's soldiers sorted themselves out and they executed a flawless operation, defeating two Russian armies and outrunning a third. Building the bridges they needed as they went, they fought their way across against almost overwhelming numbers of men and guns, the French and their trusted allies, Swiss, Germans, and Poles, outfighting their Muscovite opponents and leaving Russia as victors.
This story has many eyewitnesses, doctors, privates, generals, colonels, and one French actress. They tell of the horror and suffering, of high deeds, and the hopelessness of the snow covered vastness that is Russia in the winter.
This book is excellent, and along with its two partners, deserves wider reading. It is a superb reference for study or fun, and all three have now been produced in one volume.