Is there anywhere that I can find first hand accounts that described the effects of combat on soldiers and PTSD caused by combat. The concept of PTSD or "shell-shock" didn't really become common until World War 1, and I was curious if there were cases of PTSD described before the first World War.
You can read a lot more about this in our FAQ, but this post on why "PTSD" isn't useful as a descriptor of combat trauma before it was defined in the DSM may be of interest: