The first known photograph ever taken was by Joseph Nicéphore Niépce in 1826 or 1827, showing a view from a window of his home in France's Burgundy region.
In 1839, the first known photograph of a person was taken in Paris, showing a shoe shiner working on the Boulevard du Temple.
But it wasn't until Mathew Brady, known as the father of photojournalism, and his employee, Andrew Gardner, began shooting pictures of dead American soldiers on Civil War battlefields that the medium transformed the way people saw war.
Since then, photography has both glorified and underscored the atrocities of conflict and war.
Here are eight of the most iconic war photographs of all-time in chronological order.