AT BEAUREGARD'S HEADQUARTERS—ON DUTY AT MANASSAS.IMPORTANT DOCUMENTS INTERCEPTED AT MANASSAS, WHICH ESTABLISHED THE FACT THAT THE REBEL ARMY HAD NO INTENTION, AND WERE NOT ABLE TO ADVANCE AFTER MANASSAS—THE REBEL ARMY DEMORALIZED BY SUCCESS, AND TWENTY-FIVE PER CENT. ABSENT FROM EPIDEMIC—ON THE FIELD AFTER THE BATTLE—OBSERVATION INSIDE REBEL CAMPS—TALKING WITH RICHMOND BY WIRE—CAPTURED BY REBEL PICKET IN SIGHT OF THE SIGNAL LIGHTS AT GEORGETOWN COLLEGE.CHAPTER XI.