"The smoke in the right distance, previously thought to indicate rifle fire, turned out to be smoke from campfires; upon closer inspection, the artillery battery in the left distance stands inactive, its guns still attached to their limber chests," Frassanito wrote. "The man in the foreground, probably posed, is gazing through his binoculars toward the front-line positions near Bloody Lane, a mile distance and on the opposite side of Antietam Creek."
During an Antietam visit in September 2015, I shot the "now" image from a spot near where Gardner took his photograph. I used the fabulous, free and easy-to-use Juxtapose to create the slider. What was a largely open ground in 1862 is now blanketed with trees.