Who one of the leading poets of the First World War, who was the first known user of the phrase  "the pity of war" ?
The Pity of War: The first known use of the phrase "the pity of war" was by Wilfred Owen in 1918, in the preface to his collected poems, which would be posthumously published. Wilfred Owen: Wilfred Edward Salter Owen, MC (18 March 1893 – 4 November 1918) was an English poet and soldier, one of the leading poets of the First World War.
Wilfred Edward Salter Owen