Earlier poets certainly recognised the sadness of war ('the flowers of the forest are withered away'). But they didn't question its association with heroism and glory. Even Siegfried Sassoon's first war poems, written before he had experienced war at first hand, showed he hadn't yet shaken off an old-fashioned romantic view of it.
This was how 19th century readers and writers, especially those from a privileged background, viewed the life of 'the fighting man'. 'Warriors' were 'heroes', war was a 'heroic struggle' of 'good against evil'; 'the foe' must be 'vanquished' by 'noble deeds' on the battlefield under a flag tattered by gunshot but still 'valiantly' flying.
Many young men like Siegfried Sassoon went into the First World War with this kind of idealism. The carnage they found there came as a tremendous shock: the way modern war was fought was different - and horrifying. In 1915 Sassoon showed fellow-poet Robert Graves a poem he had written. It began Return to greet me, colours that were my joy, Not in the woeful crimson of men slain... Robert Graves, at 20, was ten years younger than Sassoon, but had been at the front line for some time. 'Siegfried had not yet been in the trenches. I told him, in my old-soldier manner, that he would soon change his style.' Graves was right.