The Battle of Gettysburg (July 1 – July 3, 1863), fought in, and around the town of Gettysburg, Pennsylvania, as part of the Gettysburg Campaign, was the battle with the largest number of casualties in the American Civil War and is frequently cited as the war's turning point. Union Maj. Gen. George Gordon Meade's Army of the Potomac defeated attacks by Confederate General Robert E. Lee's Army of Northern Virginia, ending Lee's invasion of the North.
Between 46,000 and 51,000 Americans were casualties in the three-day battle. That November, President Lincoln used the dedication ceremony for the Gettysburg National Cemetery to honor the fallen and redefine the purpose of the war in his historic Gettysburg Address.
Today, the Gettysburg National Cemetery and Gettysburg National Military Park are maintained by the U.S. National Park Service as two of the nation's most revered historical landmarks.