...roops about Harper's Ferry were recalled to Sharpsburg by orders suitable to the urgency of the occasion. Jackson, leaving A. P. Hill's division, marched back on the evening and night of the 15th. J. G. Walker was close behind him. These two reached Sharpsburg during the forenoon of the 16th. McLaws and Anderson were a day later, and arrived on the morning of the 17th after the battle had been some hours...