Confederate Gen. Thomas "Stonewall" Jackson leads troops at Fredericksburg, both battles at Bull Run, and Chancellorsville.

A horrific battle at Fort Sumter in South Carolina opens the Civil War in April 1861.

In 1862 the ironclads Monitor and Merrimac clash, changing naval warfare forever.

The hesitancy of the Army commander at the Potomac to attack was a source of exasperation for President Lincoln.

John Singleton Mosby was a resourceful Confederate raider.

America's first black regiment, the 54th Massachusetts, fights at Fort Wagner.

Photographer Alexander Gardner captures bloody battlefield scenes.

John Brown attacks Harpers Ferry (W.Va.) in 1859.

Both sides learn the horror of war at the First Battle of Bull Run.

Pickett charges Union forces at Gettysburg.

The Civil War's bloodiest battle changes Gettysburg forever.

Union and Confederate flags are more than symbols of pride.

West Point classmates fight on opposite sides.

Robert E. Lee is known as much for his character as his leadership.

Sherman's army burns everything from Atlanta to Savannah, Ga.

A profile of Gen. Joshua L. Chamberlain, a rhetoric professor who received the Medal of Honor for his defense of Little Round Top at Gettysburg, Pa.

Battle of Gettysburg aftermath; Lincoln's Gettysburg Address.

Soldiers fight diseases such as typhoid and dysentery.

The Confederate army undermines the Union soldiers at the Battle of Fredericksburg.

Abolitionist Frederick Douglass.

Journalists Alfred Waud, Winslow Homer, Alexander Gardner bring war reports to the homefront.

The battle at Gettysburg affects the townspeople.