JULY 21ST.—A Marylander, a lieutenant employed by Gen. Winder to guard the prisoners (the generals and other high Yankee officers), came to me to-day, with a friend who had just arrived from Baltimore, and demanded passports to visit Drewry’s Bluff, for the purpose of inspecting the defenses. I refused, fearing he might (I did not like his face) have been corrupted by his prisoners. He said very significantly that he would go in spite of me. This I reported to the Assistant Adjutant-General, and also wrote a note to Gen. Wise, to examine him closely if he came within his lines.