of the greatest armies in North American history marched and clashed in an epic three-day struggle. That battle was part of a carefully planned campaign intended to clench support for the fledgling Confederacy by threatening the Union capital and forcing the Army of the Potomac into smashing itself against Lee's courageous divisions.

Instead, under the new leadership of General George Meade and with the able subordinates in blue, the Army of the Potomac made a heroic stand on the rolling hills outside Gettysburg town, against the increasingly desperate Army of Northern Virginia led by General Robert E. Lee.

Although the Civil War would continue for another two years, the battle marked a high point for the Confederacy and a key turning point of the war.

Lincoln chose this moment to deliverone of the most iconic speeches in American history. The Gettysburg Address was short, but poetic and long on symbolism. During the occasion, few images were taken and two were thought to include the president.

Reviewing images of the period is difficult because cameras required long exposure times of several seconds and any motion caused blurring.

There is now a suspected third apparition of Lincoln in the Gettysburg photos. However, historians vehemently dispute the quality of the claim. Part of the issue is that if the image is accurate, then Lincoln could not have been in the other spots and historians have been wrong all along about Lincoln's location in the images.

In fairness, the image is very unclear. Christopher Oakley, a former Disney animator and professor of history at the