(September 17, 1862.)
Cobb's Brigade crossed the Potomac at daybreak and halted near General Lee's Headquarters west of Sharpsburg. At about 9:20 A.M., it formed line on the south side of Bloody Lane, its left resting at this point and, with Rodes' and portions of Garland's and Colquitt's Brigades, participated in the engagement with French's Division of the Second Corps. Later in the day the Brigade changed front to the right, facing east, and supported D. H. Hill's Division and George T. Anderson's Brigade in resisting the advance of Richardson's Division.