• Site of the 'afternoon battle' of the Sept. 1862 Battle of Antietam.
• The caption on the original says "ALEX. GARDNER, Photographer, Entered according to act of Congress, in the year 1866, by A. Gardner, in the Clerk's Office of the District Court of the District of Columbia. 511 Seventh Street, Washington."
• The previous page says:

"Antietam Bridge, Maryland."

"This structure crosses Antietam Creek on the turnpike leading from Boonesboro to Sharpsburg, and is one of the memorable spots in the history of the war, although but little suggestive in its present sunny repose, of the strife which took place near it, on the day of the battle of Antietam. Traces of the engagement are evident in the overturned stone wall, the shattered fences, and down-trodden appearance of the adjacent ground. On the night of the 16th of September, the cavalry of the Army of the Potomac captured this bridge after a sharp fight, holding it until the infantry came up. The fire of our artillery, planted on the ridges near the bridge, was terrible, and at one time no doubt contributed principally to the success of our partially disordered lines in checking the headlong assaults of the enemy."

"After Lee's second invasion of Maryland, which ended with the battle of Gettysburg, and the escape of his army into Virginia at Williamsport and Falling Waters, Gen. Meade had his headquarters for a number of days on a wooded ridge called the “Devil's Backbone,” situated near this stream, along which the Army of the Potomac was encamped. Very little now remains to mark the adjacent fields as a battle ground. Houses and fences have been repaired, harvests have ripened over the breasts of the fallen, and the ploughshare only now and then turns up a shot, as a relic of that great struggle."