In May 1863, Thomas Jonathan “Stonewall” Jackson had executed one of the boldest flank attacks in American military history, marching his corps twelve miles through dense Virginia woods to smash the exposed right flank of the Army of the Potomac at Chancellorsville. Two months later, in the farmlands of Pennsylvania, the roles were reversed and a Confederate army was on the offensive. But this time, the man holding the line was not a young, dashing cavalryman. He was a sixty-two-year-old engineer who had spent most of his life building bridges and aqueducts rather than commanding soldiers in battle.
His name was George Sears Greene, and what he accomplished on a heavily wooded hill outside Gettysburg may stand as one of the most important and least celebrated defensive actions of the entire Civil War. At first glance, the comparison seems improbable. Jackson at Chancellorsville was an aggressive tactical masterstroke that turned an entire Union army. Greene at Gettysburg was a desperate, static defense against overwhelming odds.
Different battles, different circumstances, different commanders. Yet the tactical similarities are striking. Both men understood that a single vulnerable flank could decide the fate of an entire battle. Both recognized that terrain was not merely a backdrop but a weapon to be used.
Both relied on rapid tactical judgment rather than overwhelming numbers. But the similarities end there. Jackson’s flank march was offensive, a daring strike of surprise. Greene’s stand was defensive, a desperate attempt to hold ground that, if lost, would expose the entire Union army.
Jackson commanded a corps of nearly 30,000 men. Greene led a single brigade of 1,400 New Yorkers. Jackson achieved complete surprise and overwhelmed a Union corps. Greene held his ground against a Confederate division that outnumbered him by more than three to one.
To understand what Greene accomplished at Culp’s Hill, it is necessary first to understand how the Union army arrived there. In the spring of 1863, the Confederacy had won stunning victories at Fredericksburg and Chancellorsville, but at a terrible cost. Lee had lost Jackson to friendly fire, and his army was exhausted, undersupplied, and in desperate need of reinforcements. Lee made a fateful decision.
He would take the war north. An invasion of Pennsylvania would allow his army to live off the rich farmland, relieve pressure on Virginia, threaten Washington, and perhaps force the Union to pull troops from the Western theater. Most importantly, a decisive victory on Northern soil might bring international recognition to the Confederacy. The Union response was slow and uncertain.
Major General Joseph Hooker, still suffering from the effects of his defeat at Chancellorsville, pursued cautiously. On June 28, Lincoln replaced Hooker with Major General George Gordon Meade, who moved north, seeking to place himself between Lee and Washington. Neither commander expected to fight at Gettysburg. The battle began almost by accident on July 1, when Confederate forces advanced and encountered Union cavalry under John Buford, who had occupied the high ground outside town.
Reinforcements rushed to both sides. By the end of the day, the Confederates had pushed Union forces through the town, but not before the Federals had secured the high ground to the south. The exhausted, disorganized Union army fell back to a series of ridges: Cemetery Hill, Cemetery Ridge, with the distant right flank secured by a heavily wooded elevation known as Culp’s Hill. The line formed the shape of a fishhook, with Culp’s Hill at the barbed end.
It was not a position the Union army had chosen in advance. They had retreated to it desperately, but it was strong. The ridges provided elevation, clear sight lines, and defensive cover. Culp’s Hill, with its steep, boulder-strewn slopes and dense woods, was particularly formidable.
It anchored the entire Union right flank and protected the army’s vital supply line, the Baltimore Pike, which ran behind the hill. The hill’s strategic importance was immediately clear. If the Confederates could seize it, they would be in the rear of the Union army. They could cut the Baltimore Pike, severing the army’s supply and retreat routes.
They could roll up the entire Union line. Major General Henry Slocum, commander of the Union Twelfth Corps, was responsible for its defense, but his corps was about to be stripped of most of its strength. The man left to hold the line was born in Rhode Island on May 6, 1801, into a distinguished military family. He was a cousin of Nathanael Greene, one of George Washington’s most trusted generals.
But his path to glory was not direct. Entering West Point at eighteen, he graduated second in the class of 1823, an achievement that would normally have led to a commission in the elite Corps of Engineers. Instead, Greene chose the artillery and served thirteen years without particular distinction before resigning in 1836. He then began a second career as a civil engineer, achieving remarkable success over the next twenty-five years.
He designed and built railroads throughout the Northeast, served as chief engineer of the Croton Aqueduct, which brought fresh water to New York City, designed and built the Great Reservoir in Central Park, and worked on water and sewage systems in major American cities. In 1875, he was elected president of the American Society of Civil Engineers. When the Civil War broke out in 1861, Greene was sixty years old, an age at which most men would not have considered returning to military service. But in January 1862, he was appointed colonel of the 60th New York Volunteer Infantry.
His men called him “Old Man” or “Pappy Greene,” nicknames that were affectionate but also acknowledged his age. He proved an effective commander. His engineering background gave him an innate understanding of terrain and defensive positions, and his West Point training gave him a disciplined approach to tactics. One soldier described him as an excellent officer with a kind heart under a rough exterior.
He saw his first major combat at Antietam in September 1862, fought at Chancellorsville, and then in the summer of 1863, received orders to march north toward Pennsylvania. By the time Greene reached Gettysburg on the evening of July 1, he was the oldest Union general on the field. His brigade consisted of five New York regiments totaling about 1,400 men. On the morning of July 2, they arrived at Culp’s Hill, and Greene surveyed the position with the eye of a trained engineer.
He saw a densely wooded slope with excellent fields of fire, natural obstacles that would slow any attacking force, and a position that could be made stronger with field fortifications. He immediately ordered his men to begin building defensive breastworks. His soldiers cut trees on the dense slopes and stacked them as barriers, using firewood found stacked nearby and piling loose stones on top. By the time they finished, the breastworks stood five feet high.
The decision to build entrenchments was controversial. Many officers on both sides opposed field fortifications, believing they weakened the offensive spirit. Even Greene’s own division commander, General John Geary, was opposed. But Geary left the decision to his brigade commanders.
Greene realized his small force would need every possible advantage. With the Confederates wasting most of the day and failing to coordinate their attacks, his men worked steadily, and by late morning the breastworks were nearly complete. July 2 proved to be one of the most important days of the war. Robert E.
Lee’s plan was ambitious: attack both ends of the Union line simultaneously, Longstreet against the left flank and Ewell against the right. The coordinated attack would have stretched the Union army to the breaking point, but the plan collapsed almost immediately. Longstreet was slow to move, and his attacks did not begin until late in the afternoon. Ewell waited for Longstreet’s attack before launching his own demonstration.
The result was a series of uncoordinated attacks rather than the single crushing blow Lee had envisioned. As the crisis mounted on the Union left, Meade made a fateful decision. He ordered reinforcements rushed from the right flank to the left. The Twelfth Corps, the troops defending Culp’s Hill, was the primary source.
General Alpheus Williams began shifting his troops from their positions, but one brigade was left behind. Greene’s brigade was ordered to remain and hold the position with whatever forces were available. His thin line was stretched to cover the entire front. Most of the Twelfth Corps had been pulled away.
Meade was confident that Culp’s Hill, with its weakened defenses, would not be attacked. It was past six in the evening, the day was fading, and he believed the Confederates would not attack in the dark. He was wrong. On the Confederate side, General Richard Ewell finally decided to move.
He ordered three brigades of Major General Edward “Allegheny” Johnson’s division, about 4,700 men, to attack Culp’s Hill. Facing them were Greene’s 1,400 New Yorkers. The contrast could not have been starker. On one side, nearly 5,000 seasoned Confederate veterans.
On the other, 1,400 New Yorkers, mostly farmers and laborers only months before, huddled behind hastily erected breastworks. Greene’s men were outnumbered more than three to one, defending the most vital position on the battlefield. As dusk settled, Johnson’s division began its advance. The Confederates crossed Rock Creek and moved up the steep, rocky slopes of Culp’s Hill through dense woods and fading light.
Two brigades struck the main hill, while the third, under Brigadier General George Marline Steuart, attempted to turn the Federal right flank. The Confederates ran directly into Greene’s formidable fortifications. The New Yorkers poured devastating fire into the attacking ranks, and the assaults were repulsed with relatively few Union casualties while Confederate losses were heavy. But Steuart’s brigade succeeded in turning the Federal right flank, and Union troops fell back to a hastily built extension of their fortifications.
The line reached the breaking point. The men were exhausted, and ammunition was nearly gone. The Confederates managed to occupy part of the Twelfth Corps trenches at the foot of the hill, trenches built by brigades that had left earlier to reinforce the Union left, but the crest of Culp’s Hill remained in Federal hands. Desperately in need of reinforcements, Union command rushed whatever troops were available to Culp’s Hill, including battered regiments from the First and Eleventh Corps.
Both sides strengthened their positions during the night, the Confederates holding the lower slopes and the Union forces reinforcing the upper defenses. Before sunrise on July 3, the battle for Culp’s Hill resumed. Five Union batteries opened deadly fire on the Confederate lodgment, and the Confederates renewed their assault. The fighting that followed was the most sustained of the entire battle, lasting nearly seven hours on July 3 alone.
Johnson’s men attacked three times. Each attack failed. Reinforced by units from the First and Sixth Corps, the Union position was too strong for the Confederates to capture. By noon, it was over.
Ewell’s attacks against the Union right flank had failed. The Confederates were driven from their last foothold on Culp’s Hill, and the Union line held. Greene’s defense succeeded because of four interconnected factors. The terrain was ideally suited for defense, with steep, boulder-strewn slopes that slowed the Confederate advance and provided natural cover.
Field engineering was crucial; the breastworks were among the most important field fortifications of the Gettysburg campaign, providing cover and doubling the effectiveness of the small force. Greene’s calm, disciplined leadership kept his brigade cohesive through the most desperate fighting, and his men, well trained and disciplined, held their fire until the enemy was close, then delivered devastating volleys. The consequences of Greene’s stand extended across the entire battlefield. By holding the right flank, Greene ensured the Confederates could not turn the Union position.
Had Culp’s Hill fallen, the Confederates would have reached the rear of the Union army, cut the Baltimore Pike, severed the supply and retreat lines, and potentially destroyed the entire Army of the Potomac. Instead, the Union army retained control of the high ground, and Lee’s options narrowed. With attacks on both flanks having failed, Lee concluded that the only remaining option was to attack the Union center. The resulting assault, Pickett’s Charge, became the most famous episode of the battle.
But it never would have happened had Greene not held Culp’s Hill. It was a gamble, a desperate attempt to break the Union line, and it failed. It is important not to overstate the case. Greene’s defense did not win the battle alone.
Union victory was the result of many factors: the courage of soldiers, leadership at all levels, Meade’s tactical decisions, and Lee’s mistakes. But Greene’s stand was essential. Without it, the Union army might have been enveloped and destroyed, and Gettysburg might have ended in Confederate victory. Historian Charles Fennell has written that the turning point of the battle occurred at Culp’s Hill when the Confederate forces were stopped.
Over the years, many misconceptions have become attached to the battle. The most enduring myth is that Pickett’s Charge alone decided the battle. The fighting on July 2, including Greene’s defense of Culp’s Hill, was equally important in determining the outcome. Another common misconception is that the fighting at Culp’s Hill was secondary.
In fact, it was the longest sustained engagement of the entire battle. Nor did Greene win the battle alone; his men were reinforced during the night, and other Union units played important roles. Field fortifications, often dismissed as secondary, were decisive to the Union victory. And the belief that age made Greene ineffective contradicts the source of his true advantage.
At sixty-two, he was the oldest Union general in the field, but his age was an advantage. Decades of experience as a civil engineer gave him an understanding of defensive works that younger officers lacked. The fighting at Culp’s Hill came at a terrible cost. Exact casualty figures vary among historians because the battle was long and confused, but the Confederates suffered severely in their attacks.
Johnson’s division lost hundreds of men on July 2 and 3. Union casualties were also significant. In the broader context, the Union army suffered about 23,000 casualties and the Confederates about 28,000. Five brigades, Union and Confederate, suffered 1,000 or more casualties at Gettysburg.
The Union victory, secured in large part by Greene’s defense, changed the course of the war. Lee’s Army of Northern Virginia was no longer capable of launching a major offensive into Northern territory. Confederate hopes of international recognition faded. The war continued for nearly two more years, but the strategic initiative had shifted to the Union.
On the evening of July 3, the battle was effectively over. Lee’s army was shattered, exhausted, and short of ammunition. The withdrawal began on July 4, the same day Vicksburg surrendered to Ulysses Grant. Greene survived, as did his brigade.
They had lost many comrades, but they had held their position and prevented a Confederate breakthrough that could have changed the outcome of the battle and perhaps the war. Greene’s contribution was recognized by his contemporaries, but over time, obscurity overtook his role. Part of the answer lies in the nature of the fighting: a desperate, confused night struggle in dense woods lacked the visual drama of Pickett’s Charge. Part lies in Greene’s character; he did not seek recognition, wrote no memoirs, and returned to civilian life after the war.
Part lies in the broader historical narrative, which made Gettysburg a story of Joshua Chamberlain and Little Round Top and Pickett’s Charge, leaving Culp’s Hill a footnote. In recent decades, historians have begun to reassess Greene’s contribution. The National Park Service has worked to preserve the battlefield and improve visitor understanding. A statue of Greene stands at the summit of Culp’s Hill, and his grave in Warwick, Rhode Island, is marked with a rock from the hill he defended.
Greene lived long after the war ended, dying on January 28, 1899, at the age of ninety-seven, the oldest Union general and the oldest living West Point graduate. He lived to see the nation reunited and the war become history. He also lived to see his contribution recognized as one of the most important events of the entire war. His legacy extends beyond Gettysburg.
His career as a civil engineer helped shape modern America: he built railroads, designed aqueducts, created water systems that made cities livable, and was a founding member of the American Society of Civil Engineers. In this sense, Greene’s life was a bridge between two worlds, the early American republic in which he was born and the modern industrial America he helped build. Jackson at Chancellorsville proved the power of bold, rapid offensive maneuver. Greene at Culp’s Hill proved the power of preparation, engineering, and discipline.
Jackson showed that a daring attack could win a battle. Greene showed that a resolute defense could save an army. His stand remains one of the least celebrated but most important defensive actions of the American Civil War. His brigade of 1,400 New Yorkers repulsed more than 4,700 Confederates on the evening of July 2, 1863, held their position through the night and into the next day, fighting for nearly seven hours on July 3 alone.
They preserved the Union right flank, protected its supply line, and prevented a Confederate breakthrough that could have changed the outcome of the battle and perhaps the entire war. In an age that valued youthful boldness, Greene proved that experience, intelligence, and preparation could be just as valuable. He was not a flawless hero or an unrecognized genius.
He was a competent, dedicated officer who did his duty at the most critical moment, and in doing so, helped save the Union army and perhaps the Union itself.