War brings out the best in us--heroism, nobility, and sacrifice--and the worst in us--hatred, savagery, and vengefulness.
From ancient times to the present, poets have explored the experience of war. War is a subject of most of the great western epics--the Iliad, Aeneid, Beowulf, Chanson de Roland, Paradise Lost, etc. War is the subject for modern day popular poet such as Bob Dylan and Bruce Springsteen.
To better understand the relationship between war and poetry, I read The Poetry of War, by James Winn. Though a professor of English at Boston University, Winn writes in a clear compelling a clear and avoids academic jargon.
What is like to face death or to kill another man? Perhaps only a poet can convey a sense of the emotions of men at war. Winn shows how poets from Homer to Randall Jarrell have praised heroes while raising questions about the basic nature of heroism, celebrated victors but wondered about the ultimate bitter fruits of victory, and found the passion and energy of war both enthralling and repulsive.
While awaiting the poet who can explain what we are doing in Iraq, I recommend that you read The Poetry of War.