Although Gen. William Tecumseh Sherman's force is defeated at Kennesaw Mountain in Georgia, the outnumbered Confederate Army falls to a defensive position in Atlanta; President Abraham Lincoln defeats challenger George McClellan; Sherman's March to the Sea.

The Confederate Army of Northern Virginia succeeds at splitting the Union Army in two during the Battle of Chickamauga; Gen. William Rosecrans is replaced by Gen. Ulysses S. Grant, who plans an offensive.

The Emancipation Proclamation ends slavery and gives blacks the freedom to fight; on July 4, 1863, the day after Pickett's Charge at Gettysburg, the Confederates surrender Vicksburg, Miss., to Gen. Grant; the campaign moves eastward to Chattanooga, Tenn.

Gen. Ulysses S. Grant's counter-attack at Shiloh, Tenn., leads to victory; thousands of escaping slaves seek refuge with Union forces advancing into the South; President Abraham Lincoln begins drafting a proclamation addressing slavery and freedom.

On April 6, 1862, the Confederate force's surprise attack against the Union in Shiloh, Tenn., results in some of the most brutal fighting of the Civil War.

Elizabeth McGovern plays Lady Cora on historical drama series "Downton Abbey." In this docuseries, she explores lives of young American heiresses who inspired the popular program, specifically those between the 1870s and the start of World War I. During that period, more than 200 daughters of U.S. millionaire families married into British aristocracy, providing cash to crumbling English manors but gaining peerage titles for the ladies. McGovern also tours Highclere Castle, the setting of fictional Downton.