A major literary figure in pre-war Paris, Guillaume Apollinaire volunteered for war in 1914, trained as an artilleryman and was posted in April 1915 to the Champagne front in northern France, participating in the bloody but little-known offensive that September and then moving into the front line as an infantry officer, before being wounded in March 1916 and invalided out of active service. Back in Paris, Apollinaire plunged back into the activities...