...hmond, Va. The letter which she was charged with writing, was inclosed in a box, and directed to Rev. Morgan Dix; both were then placed in a buff envelope, and addressed to Miss H. Harris, New York.-- Captain George Washington Alexander , commandant at Castle Thunder, was relieved from command at that point, and confined to his quarters, under arrest, charged with malfeasance in office. It was alleged that he extorted large sums of...