JOHNSTON'S MOVEMENTS—FORTIFICATIONS AT HAINES' BLUFF—EXPLOSION OF THE MINE—EXPLOSION OF THE SECOND MINE—PREPARING FOR THE ASSAULT—THE FLAG OF TRUCE—MEETING WITH PEMBERTON—NEGOTIATIONS FOR SURRENDER—ACCEPTING THE TERMS—SURRENDER OF VICKSBURG.RETROSPECT OF THE CAMPAIGN—SHERMAN'S MOVEMENTS—PROPOSED MOVEMENT UPON MOBILE—A PAINFUL ACCIDENT—ORDERED TO REPORT AT CAIRO.CHAPTER XXXIX.