World War I began disastrously for the English when the Germans routed them at Mons, Belgium, on August 23 and 24, 1914. On September 29, 1914, the Anglo-Welsh writer Arthur Machen fictionalized this encounter in a newspaper story, claiming that the English were saved by the appearance of angelic bowmen sent by St. George. But his fiction became accepted as fact. The believers--notables G. K. Chesterton, Arthur Conan Doyle and C. S. Lewis, along...