An Item from Fortress Monroe.
--It is stated in a letter to the New York Herald that ‘"Col. Dimmick had a narrow escape, Sunday night from being himself a victim to the close watch of his sentinels. He had been in a boat to the light-ship, stationed between Capes Henry and Charles, and, upon his return, was challenged at the water battery. From some cause, he neglected to give the word, and a shot was fired, which narrowly missed him, and severely wounded in the shoulder a soldier standing behind him. In an instant twenty men were on the spot, and a volley would have killed every one on board, but for the promptitude of another man, who plunged into the water, and succeeded in acquainting those at the battery who their supposed one miss were."’