Battle of Gettysburg

The battle arose from a Confederate attempt to carry the war into Union territory after the Union victory at Chancellorsville. Lee’s Army of Northern Virginia crossed the Potomac River in June 1863, seeking supplies, political advantage, and perhaps a decisive victory that might weaken Northern support for the war or encourage foreign recognition of the Confederacy.¹ The Union Army of the Potomac, commanded by George G. Meade from June 28, moved north to protect Washington, D.C., and Baltimore.

Gettysburg was not selected in advance as the battlefield. Its roads converged there, and Confederate troops entered the town on July 1 while searching for supplies. Union cavalry under John Buford delayed the advancing Confederates west of town, allowing Federal infantry to arrive. The engagement expanded rapidly as both armies concentrated near a modest Pennsylvania crossroads.

The first day initially favored the Confederates, who drove Union forces through Gettysburg to defensive positions south of town. Federal troops held Cemetery Hill, Culp’s Hill, and Cemetery Ridge, forming a strong fishhook-shaped line. On July 2, Lee attacked both Union flanks. Fighting at Little Round Top, the Wheatfield, Devil’s Den, and Culp’s Hill became especially intense, but the Union line remained substantially intact.

On July 3, Lee ordered a central assault later known as Pickett’s Charge. Confederate infantry advanced across open fields toward Cemetery Ridge under artillery fire. Union musketry and artillery shattered the attack; fewer than half of the approximately 12,500 Confederates who began the assault reached the Union line.² Confederate cavalry actions east and south of Gettysburg did not alter the result.

The Union victory forced Lee to retreat toward Virginia, ending his campaign in Pennsylvania. The battle did not immediately end the Civil War, but it removed the Confederacy’s immediate offensive momentum in the eastern theater. Combined with the Union capture of Vicksburg on July 4, Gettysburg strengthened Northern confidence and contributed to a strategic shift toward sustained Federal offensives.³

Casualty figures vary because wartime records were incomplete, but historians commonly estimate roughly 51,000 killed, wounded, missing, or captured across both armies. The dead included soldiers from nearly every Northern state and many parts of the Confederacy. The battlefield also produced extensive civilian suffering, including damaged farms, requisitioned livestock, disrupted commerce, and the difficult recovery and burial of thousands of bodies.

Gettysburg’s meaning expanded after the fighting through memory, commemoration, and political language. On November 19, 1863, Abraham Lincoln dedicated the Soldiers’ National Cemetery with the Gettysburg Address, a brief speech that reframed the war as a test of representative government and equality rather than only a contest over territory.⁴

The battlefield was preserved unusually early through private fundraising and state action, eventually becoming Gettysburg National Military Park. Its landscape includes farms, roads, artillery positions, monuments, and the town itself, making preservation a historical and environmental undertaking rather than a simple memorial project.⁵ The battle also had a medical legacy: overwhelmed field hospitals, including facilities at churches and farms, illustrated both the scale of Civil War trauma and the limits of nineteenth-century surgery and infection control.

Army of Northern Virginia

The principal Confederate army in the eastern theater, commanded by Robert E. Lee during the Gettysburg campaign.

Army of the Potomac

The principal Union army operating against Confederate forces in Virginia and Pennsylvania.

Pickett’s Charge

The failed Confederate infantry assault against the Union center on July 3, 1863.

Gettysburg Address

Abraham Lincoln’s speech dedicating the Soldiers’ National Cemetery at Gettysburg on November 19, 1863.