One of the most interesting incidents of the battle of Bull Run, says a Southern journal, is presented in the case of Willie P. Mangum, Jr., son of Ex-Senator Mangum, of North Carolina. This young man was attached to Col. Fisher’s regiment, and owes the preservation of his life to a copy of the Bible presented him by his sister. He had the good book in his left coat-pocket. It was struck by a ball near the edge, but the book changed the direction of the bullet, and it glanced off, inflicting a severe, but not dangerous flesh wound. The book was saturated with blood, but the advice written on a fly-leaf by the sister who gave it was perfectly legible.