Luck the filmmakers who seek to tell the tale of the Master. Tolkien was more than great writer, he was a great man in every respect.
A man whose relatives were shocked when he elected not to immediately volunteer for the British Army, and who later recalled that "in those days chaps joined up, or were scorned publicly. It was a nasty cleft to be in for a young man with too much imagination and little physical courage." But he did join, later writing that "Junior officers were being killed off, a dozen a minute. Parting from my wife then...it was like a death."
"One has indeed personally to come under the shadow of war to feel fully its oppression; but as the years go by it seems now often forgotten that to be caught in youth by 1914 was no less hideous an experience than to be involved in 1939 and the following years. By 1918 all but one of my close friends were dead." - J.R.R. Tolkien