29th.—Struck tents near Alexandria, at 10 A. M., and have marched in direction of Fairfax Court House, I suppose to go to Bull Run, to reinforce General Pope, who with fifty thousand men is now engaged with Jackson and Longstreet’s army, over one hundred thousand strong. I hope to God that may be our destination, and that we may be in time. We have marched to-day only about six miles. The day is beautiful and cool, the roads fine. Why do we not go further. Is it because we have other destination than what I hoped?