On the path to Mordor, stronghold of Sauron, the Dark Lord, the air is “filled with a bitter reek that caught their breath and parched their mouths.” Tolkien later acknowledged that the Dead Marshes, with their pools of muck and floating corpses, “owe something to Northern France after the Battle of the Somme.”

In a lecture delivered in 1939, “On Fairy-Stories,” Tolkien explained that his youthful love of mythology had been “quickened to full life by war.”