The Gettysburg Battle, fought from July 1 to July 3, 1863, in and around the town of Gettysburg, Pennsylvania, is often cited as the most decisive engagement of the American Civil War. It began not with a grand, planned assault, but as an unplanned collision of two massive armies, drawn together by a series of fateful decisions and strategic necessities. Understanding how the battle started requires looking at the broader context of the war in 1863 and the specific movements of the Union and Confederate forces in the days leading up to that first day.
The Strategic Backdrop: A War at a Crossroads
By the summer of 1863, the Civil War had been raging for two years with no clear end in sight. The Eastern Theater, where the majority of the major battles occurred, was a bloody stalemate. The Union Army of the Potomac, under the command of Major General George G. Consider this: meade, had just suffered a devastating defeat at the Battle of Chancellorsville in Virginia, where the legendary Confederate General Robert E. Lee had outmaneuvered and defeated a larger Union force. This victory, however, came at a high cost for the Confederacy, as their top corps commander, General Stonewall Jackson, was fatally wounded by friendly fire.
Emboldened by his success at Chancellorsville, Lee decided to take the war to the North. Because of that, c. In practice, a successful invasion of the North could also potentially draw Britain or France into recognizing the Confederacy. His objectives were multifaceted. Day to day, he aimed to relieve the pressure on war-torn Virginia by foraging for supplies in the fertile Pennsylvania countryside. More importantly, he sought to inflict a major defeat on the Union Army of the Potomac, hoping to force the Lincoln administration to negotiate peace. Now, for the Union, the imperative was to stop Lee's army before it could achieve these goals and to protect the capital, Washington, D. , from further threat.
The Immediate Causes: The March North and the Union Response
The direct trigger for the battle was the movement of the two armies into Pennsylvania. On June 3, 1863, General Lee began his second invasion of the North, leading his Army of Northern Virginia across the Potomac River. His force, numbering approximately 75,000 men, was organized into three infantry corps and a cavalry division That's the part that actually makes a difference. Turns out it matters..
The Union Army of the Potomac, still reeling from Chancellorsville, was initially commanded by Major General Joseph Hooker. Day to day, meade. Worth adding: meade was ordered to pursue Lee and bring his army to battle. On the flip side, following Hooker's resignation in late June, command fell to the cautious and competent Major General George G. The Union army, also around 90,000 men, began a rapid march northward, crossing into Maryland and then Pennsylvania in pursuit Easy to understand, harder to ignore..
Some disagree here. Fair enough.
The initial movements were like a slow-motion collision. In real terms, lee's army advanced into the Shenandoah Valley and then into south-central Pennsylvania, while Meade's army moved to intercept. Now, the two forces were converging on the same region, but neither commander initially knew the other's exact location or strength. The fog of war was thick.
The Spark: The Search for Shoes and the Encounter at Gettysburg
A seemingly minor logistical need became the catalyst for the battle. Stuart was ordered to screen the army's advance and gather intelligence on Union movements. But stuart. Ewell's corps advanced into Pennsylvania, a specific instruction was given to his cavalry commander, Major General J.B. So naturally, e. Here's the thing — as Confederate General Richard S. On the flip side, Stuart chose a more dramatic route, embarking on a raid that would take his cavalry on a wide loop through Maryland and around the Union army, temporarily cutting off communication between the Union forces and Washington.
This created a critical intelligence vacuum for both sides. And while Stuart was absent, Lee was operating without real-time information on the Union army's location. Meanwhile, the Union was equally blind to the Confederates' precise whereabouts.
The immediate spark that lit the fuse for the battle at Gettysburg came from a different direction. The raid was unsuccessful, but it had a significant consequence. Now, on June 27, a detachment of Confederate cavalry under Brigadier General John Pettigrew was sent to the town of Carlisle, Pennsylvania, with a specific mission: to capture a large cache of Union shoes stored there for the army. The Confederates were forced to retreat, and in their flight, they passed through the small town of Gettysburg.
It was here that the two armies first made contact. They were soon met by the advancing Confederate vanguard from General Ewell's corps, who were following the road from the north. On the morning of July 1, 1863, a Union cavalry brigade under Brigadier General John Buford had been dispatched by General Meade to secure the high ground around Gettysburg. Buford's men arrived first and took up defensive positions on the ridges west of the town. The first shots of the battle were fired as Buford's dismounted cavalrymen, armed with carbines, engaged the oncoming Confederates.
The First Day: A Battle of Opportunity and Necessity
What began as a cavalry skirmish rapidly escalated into a full-scale infantry battle. Confederate Major General Henry Heth's division, part of General A.P. Hill's corps, marched down the Chambersburg Pike directly into Buford's lines. The initial Confederate attacks were repulsed with heavy casualties, but the Union cavalry was being stretched thin Still holds up..
As the morning wore on, more Union infantry arrived, including the I Corps under Major General John F. And reynolds. Reynolds' arrival was a crucial boost to the Union defense. Even so, the Confederates, exploiting their numbers, began to envelop the Union flanks. By mid-afternoon, the pressure became overwhelming. In practice, a key moment occurred when Confederate sharpshooters in the Kulp Farm picked off General Reynolds, a highly respected and capable commander. The death of Reynolds demoralized the Union forces Surprisingly effective..
With their commander dead and their lines buckling, the Union I Corps was forced to retreat through the town of Gettysburg. The retreat was chaotic, with soldiers streaming through the streets. That said, the Confederates, however, failed to press their advantage. A critical mistake was made when General Lee, observing the retreat, did not order his troops to occupy the strategic high ground south of the town, known as Cemetery Hill. This hesitation would prove to be a fatal error.
As the sun set on July 1, both armies were exhausted but had fought a full day. Practically speaking, the Union army, having been pushed out of Gettysburg, had managed to establish a defensive line on Cemetery Hill and Culp's Hill, the very high ground Lee had neglected to seize. The Confederate army, having won the first day's tactical victory, was now positioned to the north and west of the town, facing an enemy that held a strong defensive position Worth knowing..
Timeline of the Start of the Battle
To summarize the sequence of events that started the battle:
- June 3, 1863: General Lee begins his second invasion of the North, crossing the Potomac River into Maryland.
- Late June: General Meade takes command of the Army of the Potomac and begins marching north into Pennsylvania to intercept Lee.
- June 27: Confederate cavalry under Pettigrew fail to capture shoes in Carlisle, PA, and retreat through Gettysburg.
- June 30: Union cavalry under General Buford is ordered to secure Gettysburg and the surrounding high ground.
- July 1, Morning: Buford's cavalry arrives first and takes up positions west of Gettysburg. Confederate forces under General Ewell's corps
