Mrs. Patterson Allan, charged with carrying on a treasonable correspondence with persons in the North, was arraigned before Commissioner Watson, at Richmond, 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 money from prisoners confined in that institution, by promising to use his influence for their benefit, and in some cases permitting the prisoners to go at large, upon paying him large sums of money. He was also charged with trading largely in greenbacks.--Colonel A. D. Streight, and his Adjutant, Lieutenant Reed, in attempting to escape from Libby Prison, at Richmond, Va., were detected, and “put in the dungeon.” --Major-General Grant arrived at Nashville, Tenn.