Final answer:
Matthew Brady became one of the most important early war photographers during the American Civil War. In his photograph President Lincoln at Sharpsburg, October 1862, Brady represented Lincoln formally as the mainstay of the war and the by capturing him in a dignified pose and setting in the photograph President Lincoln at Sharpsburg, October 1862.
Step-by-step explanation:
In his photograph President Lincoln at Sharpsburg, October 1862, Mathew Brady represented Lincoln formally as the mainstay of the war and the country by capturing him in a dignified pose and setting.
The photograph portrays Lincoln as a strong and determined leader, symbolizing his role in guiding the nation during the Civil War.
Brady's intention was to convey Lincoln's significance and the gravity of the war through this powerful image.