Writing history is one thing, getting people to read it is another.
If Hitler had read about Napoleon's attempt to invade Russia, he might well have left Russia alone and won the second world war, as his troops would not heve been so stretched.
If Napoleon had read about the even earlier attempt by King Christian of Sweden to invade Russia, he might not have invaded, and he might not have lost the battle of Waterloo, as his troops had been so devastated by the Russian winter.
(One piece of useless information - the Russian winter was so cold that Napoleon's troops' trouser buttons froze to bits, so they had to fight with one hand holding up their trousers. )