lilithsaintcrow, 
"The first evidence of the onset of PTSD came during Napoleon’s brief campaign in Spain in 1808, but it was when he was assigned to Andre Massena’s Spanish Army in 1810 that things began to go seriously wrong for Ney." https://militaryhistorynow.com/2024/05/12/marshal-ney-and-ptsd-how-the-mental-health-affliction-broke-napoleons-bravest-marshal/