ten o'clock
We supposed that the enemy 's advance was firing on our stragglers as they would try to get away . The march was very difficult , because of the mud and mainly because of our exhaustion . We reached the top of a high hill overlooking the Potomac a mile away . It must have been after ten o'clock . On the Virginia hills we could see a great host of men , and long lines of artillery and wagons -- some filing slowly away to the south , others standing in well-ordered ranks . On some prominent hills batteries had been planted . It was a great sight .