In eight battles of the Civil War, over 3,000 Union and Confederate soldiers were killed. The battle in which the most people were killed was the three-day engagement at Gettysburg, PA, where an estimated 7,000 men died. According to Gettysburg Battlefield Tours, “The Union troops were quickly overwhelmed and fled.” However, the Union troops stopped their retreat and held their line at Cemetery Ridge. On the second day of the battle, Lee ordered a large attack across much of the Union’s defensive positions. The third day of the battle included one of the greatest debacles of any American war.