A NIGHT'S SCOUT IN JOHNSTON'S ARMY—REBEL SIGNALS—VISITORS FROM THE UNION ARMY HEADQUARTERS REPORT TO REBEL HEADQUARTERS—GENERAL J. E. JOHNSTON'S ESCAPE TO BEAUREGARD REPORTED TO GENERAL PATTERSON—FITZ-JOHN PORTER RESPONSIBLE FOR THE FIRST BATTLE OF BULL RUN, AS HE WAS CASHIERED FOR THAT OF THE SECOND BULL RUN—AN IMPORTANT CONTRIBUTION TO THE WAR HISTORY OF THE TIME—THE STORY SINCE CONFIRMED BY THE "CENTURY" HISTORIANS OF LINCOLN, SECRETARIES NICOLAY AND HAY.REPORTING TO GENERAL BANKS' HEADQUARTERS FOR DUTY—THE LIFE OF JEFF DAVIS THREATENED—CAPTURED AT HARPER'S FERRY—INTERESTING PERSONAL LETTERS CORROBORATING THE SUPPOSED DEATH OF THE "BOY SPY."CHAPTER IX.