Dulce et Decorum Est (1921)

Gallipoli is a good movie that touches on this complex subject.

In the 1990s, in the UK, my secondary school English teacher, who had Shakespearian actor vibes and wore dark tweed trousers and a plain white shirt—imagine Patrick Stewart if you may—brought this poem to life in my class by vividly reenacting a soldier dying from mustard gas poisoning by falling onto a desk and flailing about in front of the stunnned students sitting at it. I've never forgotten the closing line since.

There's additional context here that makes this poem more powerful in my opinion.

It's a direct response to Jessie Pope, an English poet and propagandist who would write poems like "Who's for the Game?", implying that the great war was all a bit of fun and those who didn't want to go were cowards.

Owen had actually been in the trenches, and tragically died only a few days before the armistice.

It's a great song, but as a piece of poetry it's not even in the same league imo.

(This is my all time favourite poem though)