 Before World War I , H.D. married Aldington in 1913 ; however , their first and only child , a daughter , was stillborn in 1915 . Aldington enlisted in the army . The couple became estranged , and Aldington reportedly took a mistress in 1917 . H.D. became involved in a close but platonic relationship with D. H. Lawrence . In 1916 , her first book , Sea Garden , was published , and she was appointed assistant editor of The Egoist , replacing her husband . In 1918 , her brother Gilbert was killed in action , and that March she moved into a cottage in Cornwall with the composer Cecil Gray , a friend of Lawrence . She became pregnant with Gray 's child , however , by the time she realised she was expecting , the relationship had cooled and Gray had returned to live in London . When Aldington returned from active service he was noticeably traumatised , and he and H.D. later separated . 
