A new book by Lord of the Rings author JRR Tolkien is going on sale – 100 years after it was first conceived. Beren and Lúthien has been described as a “very personal story” that the Oxford professor thought up after returning from the Battle of the Somme.
Tolkien specialist John Garth, who wrote Tolkien And The Great War, said the Hobbit author used his writing like an “exorcism” of the horrors he witnessed in World War One.
See http://www.bbc.com/news/uk-england-oxfordshire-40109396 
JRR Tolkien book Beren and Lúthien published after 100 years – BBC News
The author of The Lord of the Rings came up with the story after returning from the Somme.