It is not a coincidence that some aspects of Tolkien’s Middle-Earth reflect experiences from World War One. Joseph Laconte wrote an interesting article for the New York Times on this.
In the summer of 1916, a young Oxford academic embarked for France as a second lieutenant in the British Expeditionary Force. The Great War, as World War I was known, was only half-done, but already its industrial carnage had no parallel in European history.
“Junior officers were being killed off, a dozen a minute,” recalled J. R. R. Tolkien. “Parting from my wife,” he wrote, doubting that he would survive the trenches, “was like a death.”
The 24-year-old Tolkien arrived in time to take part in the Battle of the Somme, a campaign intended to break the stalemate between the Allies and Central Powers. It did not.
You can find the rest of the article here.