Final answer:
The notable war photograph depicting the grim aftermath of the Gettysburg battle is 'The Harvest of Death,' taken by Timothy O'Sullivan.
Step-by-step explanation:
The famous war photograph capturing the aftermath of the battle in Gettysburg during the Civil War is known as The Harvest of Death. This haunting image was captured by Timothy O'Sullivan, not Roger Fenton, on July 5–6, 1863. O'Sullivan, who started his career as an apprentice to Mathew Brady, documented the grim realities of war in stark contrast to the more common portraits of soldiers and camp life at the time.
The photograph presents a bleak landscape of Gettysburg, Pennsylvania strewn with fallen soldiers, offering a somber reminder of the conflict's toll on human life.