ADVANCE ON THE CITY OF MEXICO—BATTLE OF CONTRERAS—ASSAULT AT CHURUBUSCO—NEGOTIATIONS FOR PEACE—BATTLE OF MOLINO DEL REY—STORMING OF CHAPULTEPEC—SAN COSME—EVACUATION OF THE CITY—HALLS OF THE MONTEZUMAS.PROMOTION TO FIRST LIEUTENANT—CAPTURE OF THE CITY OF MEXICO—THE ARMY—MEXICAN SOLDIERS—PEACE NEGOTIATIONS.CHAPTER XII.