Coming Up For Air by George Orwell:
“Listen, son,” I said, “you’ve got it all wrong. In 1914 we thought it was going to be a glorious business. Well, it wasn’t. It was just a bloody mess. If it comes again, you keep out of it. Why should you get your body plugged full of lead? Keep it for some girl. You think war’s all heroism and V.C. charges, but I tell you it isn’t like that. You don’t have bayonet-charges nowadays, and when you do it isn’t like you imagine. You don’t feel like a hero. All you know is that you’ve had no sleep for three days, you stink like a polecat, you’re pissing your bags with fright and your hands are so cold you can’t hold your rifle. But that doesn’t matter a damn, either. It’s the things that happen afterwards.”
Makes no impression of course. They just think you’re out of date. Might as well stand at the door of a knocking-shop handing out tracts.