CHAPTER XXVII.
GETTYSBURG.
A Hasty Departure .-- At Harrisburg .-- _En route_ for the Army of the Potomac .-- The Battle-Field at Gettysburg .-- Appearance of the Cemetery .-- Importance of the Position .-- The Configuration of Ground .-- Traces of Battle .-- Round Hill .-- General Meade's Head-Quarters .-- Appearance of the Dead .-- Through the Forests along the Line .-- Retreat and Pursuit of Lee..