(September 14-16, 1862.)
Humphreys' Division left Washington at daylight on September 14, and reached Frederick on the afternoon of September 15. During September 16 and 17 this Division was stationed in front of Frederick to protect that city. At 3:30 P.M. of September 17 it was ordered to march to the battlefield of Antietam and to reach there, if possible, at daylight. It marched at once and reached the field at 7 A.M. on September 18, 1862, relieving Morell's Division at this point.