While we're sharing anti-war songs/poetry, I like And The Band Played Waltzing Matilda (originally written by Eric Bogle, but I personally like the Pogues' version): https://www.youtube.com/watch?v=PKURhqmSLmM

Another great Eric Bogle song is Green Fields of France.

I like this version by The Men They Couldn't Hang best :

https://youtu.be/Kr6OzLJrS2k?si=ZX6lrXqjZktV20-V

I've often played this after Ralph McTell's "Maginot Waltz", which really contrasts the optimism and patriotism with the reality.

I used to play this on the street as a young lad, can't sing it at all anymore because I get too choked up to get the words out

The Australians have some incredible anti-war music. Redgum's /I was only 19/ is brutal: https://www.youtube.com/watch?v=1UYDKxxQ50o

The Pogues' version brings me close to tears, every single time. Incredible rendition.

My personal favorite is the song from the movie (not the show, haven't watched) M.A.S.H.

Or, perhaps, Vera Lynn's "We'll meet again some sunny day".

These are good movies to rewatch, especially in these interesting times.