A British soldier began writing "The Fall of Gondolin" while in a hospital bed, stricken by "trench disease" from the lethal front lines of World War I.

A German soldier later bemoaned the "lice, rats, barbed wire, fleas, shells, bombs, underground caves, corpses, blood, liquor, mice, cats, artillery, filth, bullets, mortars, fire, steel." Add poison gas to that ordeal.

Young J.R.R. Tolkien wrote: "The fume of the burning, and the steam of the fair fountains of Gondolin withering on the flame of the dragons of the north, fell upon the vale of Tumladen in mournful mists." The battlefields were "cold and terrible."

This was a vision of war from a man who had been there, said Joseph Loconte, author of "A Hobbit, a Wardrobe and a Great War." The book explores the many ways that World War I shaped Tolkien and C.S. Lewis.

"Tolkien wasn't writing escapist fantasy," said Loconte, reached by telephone. "If this is about escape, it's the writings of a prisoner who has escaped the world of cells, bars and keys. This kind of escapism … helps us realize that our prisons have windows and we can use them to see better things."

Tolkien later wrote that he began creating his Middle Earth mythology -- the foundation for the future "The Lord of the Rings" -- while "in grimy canteens, at lectures in cold fogs, in huts full of blasphemy and smut, or by candlelight in bell-tents, even some down in dugouts under shell fire."

Yes, the man who survived days huddled in shell craters and trenches in France would later write, in a blank page in an Oxford student's exam book, these famous words: "In a hole in the ground there lived a Hobbit."

Tolkien and Lewis remain stunningly popular -- in print and on digital screens.