...oving to the right, we passed through Glasscock's Gap without serious difficulty, and marched for Haymarket. I had previously sent Major Mosby, with some picked men, through to gain the vicinity of Dranesville , and bring intelligence to me, near Gum Spring, today. (You will bear in mind that Haymarket is in Prince William county, east of the Bull Run mountains, and that was the first point to which Gener...