
Originally Posted by
Marechal Ney
I have actually heard, and at least partially support, a different theory.
It is pretty much confirmable that during the Waterloo campaign, Ney was suffering from PTSD. As a man who's entire life was his honor, he may very well have felt so dishonored by his 1814 betryal of Napoleon that he eventually decided the only way to overcome it was a glorious battlefield death.
Effectively, with Napoleon ill and unable to tactically run the operations of his troops, Ney was commanding the army. Here's the thing: It appears, from later historical review, that Ney was suicidal; not just very brave and risking death, but actually wanting death. After Quatre Bras he said that he wished a British bullet had killed him; during Waterloo, he famously shouted his greatest quote, "Come see how a Marshal of France shall die!" And, most importantly, Ney had traditionally been calm in the face of death, as shells fell around him at Friedland and he fought alongside his tiny, hopeless rearguard in Russia. At Waterloo, he was angry; furious.
It seems that Ney wanted himself to get killed in a suicidal, doomed to fail cavalry charge, or an ill planned counterattack on Plancenoit (both of which he led, personally being in the front rank). So, just perhaps, the reason Napoleon lost Waterloo: His generals had post traumatic stress disorder.