The Ghost Road by Pat Barker

I didn't realize that this book was the third of a trilogy until after I read it, but I think it stands fairly well on its own. It's a World War I story, with its perspective shifting between a doctor (and his memories of his previous imperial service) and a working class officer, friends with figures such as Wilfred Owen, who is determined to go back to war despite the fact he no longer believes it is just. Winner of the 1995 Booker Prize.