What is the theme in Collected Poems by Wilfred Owen?

The false glory of war is another theme in Owen's poetry. Owen believes many soldiers were originally motivated to serve in World War I by the idea of glory, both for themselves personally and for their country. However, many soldiers, Owen included, quickly discover that there is no glory in war once they actually see battle. In Owen's incomplete preface to his poems, Owen writes that his poetry is not about heroism or glory but just war. Owen even claims that the English language is incapable of speaking of heroes. The preface strongly suggests that Owen finds no glory in the war or the concept of war.