Gurney's studies were interrupted by World War I, when he enlisted as a private soldier in the Gloucestershire Regiment in February 1915. At the front, he began writing poetry seriously, sending his efforts to his friend, the musicologist and critic Marion Scott, who worked with Gurney as his editor and business manager. He was in the midst of writing the poems for what would become his first book, "Severn and Somme", when he was wounded in the shoulder in April 1917. He recovered and returned to battle, still working on his book and composing music, including the songs "In Flanders" and "By A Bierside". Sidgwick & Jackson accepted "Severn and Somme" in July, with publication set for the autumn. In the meantime, Gurney was gassed in September the same year and sent to the Edinburgh War Hospital, where he met and fell in love with a VAD nurse, Annie Nelson Drummond, but the relationship later broke down. There remains some controversy about the possible effects of the gas on his mental health, even though Gurney had clearly shown signs and symptoms of a bipolar disorder since his teens. "Being gassed (mildly) parenthesis with the new gas is no worse than catarrh or a bad cold," Gurney wrote in a letter to Marion Scott on 17 September 1917. After his release from hospital, he was posted to Seaton Delaval, a mining village in Northumberland, where he wrote poems, including "Lying Awake in the Ward". His volume "Severn and Somme" was published in November 1917.