Battle of Gettysburg
The nature of the result of the Battle of Gettysburg has been the subject of controversy for years. Although not seen as overwhelmingly significant at the time, particularly since the war continued for almost two years, in retrospect it has often been cited as the "turning point", usually in combination with the fall of Vicksburg the following day. This is based on the observation that after Gettysburg Lee's army conducted no more strategic offensives—his army merely reacted to the initiative of Ulysses S. Grant in 1864 and 1865—and by the speculative viewpoint of the Lost Cause writers that a Confederate victory at Gettysburg might have resulted in the end of the war.
It is currently a widely held view that Gettysburg was a decisive victory for the Union, but the term is considered imprecise. It is inarguable that Lee's offensive on July 3 was turned back decisively and his campaign in Pennsylvania was terminated prematurely (although the Confederates at the time argued that this was a temporary setback and that the goals of the campaign were largely met). However, when the more common definition of "decisive victory" is intended—an indisputable military victory of a battle that determines or significantly influences the ultimate result of a conflict—historians are divided. For example, David J. Eicher called Gettysburg a "strategic loss for the Confederacy" and James M. McPherson wrote that "Lee and his men would go on to earn further laurels. But they never again possessed the power and reputation they carried into Pennsylvania those palmy summer days of 1863."
George Meade
During the Gettysburg Campaign, he was appointed to command the Army of the Potomac just three days before the Battle of Gettysburg. Arriving on the field after the first day's action on July 1, Meade organized his army on favorable ground to fight an effective defensive battle against Robert E. Lee's Army of Northern Virginia, repelling a series of massive assaults throughout the next two days. Lee was forced to retreat to Virginia, ending his hope of winning the war through a successful invasion of the North. This victory was marred by Meade's ineffective pursuit during the retreat, allowing Lee and his army to escape instead of completely destroying them. The Union Army also failed to follow up on its success during the Bristoe Campaign and Battle of Mine Run that fall, which ended inconclusively. Meade suffered from intense political rivalries within the Army, notably with Daniel Sickles, who tried to discredit his role in the victory at Gettysburg.