Lieutenant Wilfred Owen.
After serving on the Western Front from January to June of 1917, Owen was diagnosed with shell-shock, and sent to Craiglockhart Hospital for treatment. He returned to the front in September 1918, won the Military Cross for gallantry in October, and was killed while leading his men during the attack on the St Quenton Canal on November 4th just one week before the Armistice.
He was arguably the greatest of the Great War poets.