Modern poetry grew out of the First World War. English verse altered under the impact of mass murder in the trenches 1914-1918 and ceased to be cosy. The war spread to Russia and Italy and Turkey and into the Middle East, but the Western Front in France was the focus of attention at home. The opening bombardment on the Somme was heard in London.
Poetry came closer to news. Poets became war correspondents of feeling and suffering rather than celebrants of glory, honour, patria and remembrance. They ceased to be crudely national.