I do have a photo showing the aftermath of the first mustard gas attack in 1915 where everything was dead but thought it's not something I needed to post.
My Grandfather (white naval uniform my previous post Lt. Cdr. RNVR) served in WW1 in the Med and off Gallipoli. After the end he volunteered along with lots of others to go to the ex-Western front for recovery and salvage. As you can imagine, he saw things every day that a person should never. And it doesn't leave them you know. Often well hidden/tucked away for years and then woosh, it comes back. My Father (WW2 North Africa & Italy) hid his horrors until he was well into his 80s and then bits came out, telling it (often tearfully, which was VERY unlike my Dad) like it happened yesterday. Dr said it was quite typical delayed PTSD for that generation. They were all casualties.