Gettysburg Campaign - Battle of Gettysburg

Battle of Gettysburg

Further information: Battle of Gettysburg, First Day, Second Day, Little Round Top, Cemetery Hill, Culp's Hill, Third Day cavalry battles

The three-day battle in and around Gettysburg resulted in the largest number of casualties in the American Civil War—between 46,000 and 51,000. In conjunction with the Union victory at Vicksburg on July 4, Gettysburg is frequently cited as the war's turning point.

The two armies began to collide at Gettysburg on July 1, 1863. The first day proceeded in three phases as combatants continued to arrive at the battlefield. In the morning, two brigades of Confederate Maj. Gen. Henry Heth's division (of Hill's Third Corps) were delayed by dismounted Union cavalrymen under Brig. Gen. John Buford. As infantry reinforcements arrived under Maj. Gen. John F. Reynolds from the I Corps, the Confederate assaults down the Chambersburg Pike were repulsed, although Gen. Reynolds was killed. By early afternoon, the Union XI Corps had arrived, and the Union position was in a semicircle from west to north of the town. Ewell's Second Corps began a massive assault from the north, with Maj. Gen. Robert E. Rodes's division attacking from Oak Hill and Maj. Gen. Jubal A. Early's division attacking across the open fields north of town. The Union lines generally held under extremely heavy pressure, although the salient at Barlow's Knoll was overrun. The third phase of the battle came as Rodes renewed his assault from the north and Heth returned with his entire division from the west, accompanied by the division of Maj. Gen. W. Dorsey Pender. Heavy fighting in Herbst's Woods (near the Lutheran Theological Seminary) and on Oak Ridge finally caused the Union line to collapse. Some of the Federals conducted a fighting withdrawal through the town, suffering heavy casualties and losing many prisoners; others simply retreated. They took up good defensive positions on Cemetery Hill and waited for additional attacks. Despite discretionary orders from Robert E. Lee to take the heights "if practicable," Richard Ewell chose not to attack. Historians have debated ever since how the battle might have ended differently if he had found it practicable to do so.

On the second day, Lee attempted to capitalize on his first day's success by launching multiple attacks against the Union flanks. After a lengthy delay to assemble his forces and avoid detection in his approach march, Longstreet attacked with his First Corps against the Union left flank. His division under Maj. Gen. John Bell Hood attacked Little Round Top and Devil's Den. To Hood's left, Maj. Gen. Lafayette McLaws attacked the Wheatfield and the Peach Orchard. Although neither prevailed, the Union III Corps was effectively destroyed as a combat organization as it attempted to defend a salient over too wide a front. Gen. Meade rushed as many as 20,000 reinforcements from elsewhere in his line to resist these fierce assaults. The attacks in this sector concluded with an unsuccessful assault by the Third Corps division of Maj. Gen. Richard H. Anderson against the Union center on Cemetery Ridge. That evening, Ewell's Second Corps turned demonstrations against the Union right flank into full-scale assaults on Culp's Hill and East Cemetery Hill, but both were repulsed. The Union army had occupied strong defensive positions, and Meade handled his forces well, resulting in heavy losses for both sides but leaving the disposition of forces on both sides essentially unchanged.

After attacks on both Union flanks had failed the day and night before, Lee was determined to strike the Union center on the third day. He decided to support this attack with a renewed thrust on the Union right that was supposed to start in concert with his assault on the center. However, the fighting on Culp's Hill resumed early in the morning with a Union counterattack, hours before Longstreet could begin his attack on the center. The Union troops on fortified Culp's Hill had been reinforced and the Confederates made no progress after multiple, futile assaults that lasted until noon. The infantry assault on Cemetery Ridge known as Pickett's Charge was preceded by a massive artillery bombardment at 1 p.m. that was meant to soften up the Union defense and silence its artillery, but it was largely ineffective. Approximately 12,500 men in nine infantry brigades advanced over open fields for three quarters of a mile under heavy Union artillery and rifle fire. Although some Confederates were able to breach the low stone wall that shielded many of the Union defenders, they could not maintain their hold and were repulsed with over 50% casualties.

During and after Pickett's Charge on the third day, two significant cavalry battles also occurred: one approximately three miles (5 km) to the east, in the area known today as East Cavalry Field, the other southwest of the Round Top mountain (sometimes called South Cavalry Field). The East Cavalry Field fighting was an attempt by Maj. Gen. J.E.B. Stuart's Confederate cavalry to get into the Federal rear and exploit any success that Pickett's Charge may have generated. Union cavalry under Brig. Gens. David McM. Gregg and George Armstrong Custer repulsed the Confederate advances. In South Cavalry Field, after Pickett's Charge had been defeated, reckless cavalry charges against the right flank of the Confederate Army, ordered by Brig. Gen. Judson Kilpatrick, were easily repulsed.