Lincoln at Gettysburg — One of the two confirmed photos of Lincoln (center, facing camera) at Gettysburg, taken about noon, just after he arrived and some three hours before his speech. To his right is his bodyguard, Ward Hill Lamon

Photographer attributions vary from unidentified (William Frassanito) to Mathew Brady (NARA) and David Bachrach (1845-1921) (Center for Civil War Photography).
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=611580