The horrific warfare of WWI generated a condition never documented before by doctors. Shell shock was a devastating mental injury that many soldiers came home with from the battlefield during a time when proper care was not available. Learn more about this mental condition with Scott Lynch from the Motivated Mind podcast.
Sources:
https://youtu.be/_4KQpJpbwDc
https://www.bbc.co.uk/history/worldwars/wwone/shellshock_01.shtml
https://www.theguardian.com/uk/2006/aug/16/military.immigrationpolicy
https://www.history.com/topics/inventions/history-of-ptsd-and-shell-shock
https://www.iwm.org.uk/history/voices-of-the-first-world-war-shell-shock