This episode charts the dramatic events that led to Lincoln's decision to set the slaves free. Convinced by July 1862 that emancipation was now morally and militarily crucial to the future of the Union, Lincoln must wait for a victory to issue his proclamation. But as the year wears on there are no Union victories to be had, thanks to the brilliance of Stonewall Jackson and Robert E. Lee. The episode comes to a climax in September 1862 with Lee's invasion of Maryland. On the banks of Antietam Creek, the bloodiest day of the war takes place, followed shortly by the brightest: the emancipation of the slaves.

This episode opens with a dramatic account of the turning point of war: the Battle of Gettysburg, the greatest ever fought in the Western Hemisphere. For three days 150,000 men will fight to the death in the Pennsylvania countryside, culminating in Pickett's legendary charge. This extended episode then goes on to chronicle the fall of Vicksburg, the New York draft riots, the first use of black troops, and the western battles at Chickamauga, Georgia and Chattanooga, Tennessee. The episode closes with the dedication of a new Union cemetery at Gettysburg in November, where Abraham Lincoln struggles to put into words what is happening to his people.