By the afternoon of July 2, 1863, the Army of the Potomac had made nearly every mistake an army could make and still be standing. Its commander, George Meade, had been in charge for only three days. He had inherited roughly 93,000 men who had marched hard through Pennsylvania heat, slept poorly, and now found themselves stretched across unfamiliar ground outside a small college town. To the west and north, Robert E.
Lee’s Army of Northern Virginia was pressing on multiple fronts, carrying the psychological weight of two years of battlefield dominance. What was about to happen on a rocky, tree-covered hillside at the southern end of the Union line would decide whether the Army of the Potomac survived the summer. The man at the center of it, a former rhetoric professor from Maine who had never commanded men in combat before the previous year, would have less than twenty minutes to make the most consequential tactical decision of the entire war. The Union line ran roughly north to south along a series of ridges, curling at the northern end into a fishhook shape.
At the very bottom of that fishhook sat two hills: Big Round Top and, just north of it, slightly lower but far more tactically significant, Little Round Top. These two elevations commanded the entire surrounding landscape. Artillery placed on Little Round Top could fire down the length of the Union line. If the Confederates took that hill, they did not need to break through the Union center.
They could simply make the entire position untenable from above and force a retreat. The problem was that Little Round Top was nearly empty. The Union’s Third Corps commander, Daniel Sickles, had made what was possibly the single worst unilateral decision by a corps commander in the entire war. Without orders, he had advanced his entire corps forward from the high ground it was supposed to hold and planted it in a salient centered around a peach orchard, leaving his flanks completely exposed.
By moving his corps forward, he had left Little Round Top undefended at almost exactly the moment Confederate General James Longstreet was preparing to launch the largest assault of the battle directly at the Union left. The man who caught the mistake was not Meade. It was his chief engineer, Gouverneur Warren, who rode up Little Round Top and found to his horror that the hill was empty except for a small signal station. Warren looked south and west.
He could see Confederate infantry massing in the woods below. He rode hard to find someone to plug the gap. He found Fifth Corps commander George Sykes, who found a brigade commander named Strong Vincent. And Vincent, without waiting for formal orders, made the decision on his own authority to take his entire brigade up that hill.
Strong Vincent was twenty-six years old. He would be dead within two days, mortally wounded on the very ground he was riding to defend. But in that moment, he made the right call and he made it fast. Vincent’s brigade arrived on Little Round Top at roughly 4:30 in the afternoon and fanned out along the southern and western slopes.
He placed his regiments in order from right to left: the 16th Michigan, the 44th New York, the 83rd Pennsylvania, and finally, at the very end of the line, on the extreme left flank of the entire Army of the Potomac, the 20th Maine Volunteer Infantry Regiment. Their commander was Colonel Joshua Lawrence Chamberlain. Chamberlain was thirty-four years old, a Bowdoin College professor who had spoken to the administration about taking a sabbatical to study in Europe, then turned around and volunteered for the Union Army instead. He had taught rhetoric, oratory, and modern languages.
He had read Homer in the original Greek. He had no formal military training before the war. What he had was an unusual combination of qualities: a systematic intellect, a capacity for calm under pressure, and a willingness to absorb information from the men around him who knew things he didn’t. He also inherited, at the start of this campaign, a complication that would have broken a lesser officer’s spirit before a single shot was fired.
Two weeks before Gettysburg, the army had sent the 20th Maine a batch of mutineers. Not deserters, mutineers. These were 120 men from the Second Maine Regiment who had signed up for a two-year enlistment, served it out faithfully, and then been told, incorrectly, through an administrative error, that they had actually signed three-year terms. When they refused to accept this and refused to fight further, they were placed under armed guard and transferred to Chamberlain’s command with written orders that he could shoot any man who refused to comply.
Chamberlain read those orders, folded them, put them in his pocket, and went to talk to the mutineers personally. He didn’t threaten them. He sat with them, acknowledged that they had been wronged, told them he had no power to fix the administrative error, but that he did have the power to treat them with decency, and explained quietly what he believed they were fighting for. He asked them to fight.
Not all of them came around, but most did. And on July 2nd at Little Round Top, those men, former mutineers, fought as hard as anyone on that hill. Strong Vincent placed the 20th Maine on the far left with a very specific instruction. He told Chamberlain that this was the left flank of the Union Army, that there was nothing beyond him, and that he must hold that position at all costs.
He added a phrase that Chamberlain would remember for the rest of his life. “You are to hold that ground at all costs. Not hold it if you can. Not hold it unless it becomes untenable.
Hold it at all costs. Period. ”
Chamberlain deployed his roughly 386 men along the slope and then did something smart. He sent his brother, Tom, who was serving as a company commander, to scout the ground to the left.
Tom came back and reported what nobody wanted to hear. The ground extended further than they had thought. If the Confederates came around the end of the line, they could flank it entirely. Chamberlain responded by bending his left flank backward, swinging it like a door hinge, so that it formed a right angle with the main line.
His men barely had time to catch their breath when the Confederate attack began. The men coming up that hill were the 15th and 47th Alabama Infantry, commanded by Colonel William C. Oates. Oates was thirty years old, a self-made lawyer from Alabama.
His men had spent the morning of July 2nd on a forced march that had covered nearly thirty miles in brutal heat. They had arrived at their jump-off position parched and exhausted. Oates had sent two companies to find water. They hadn’t returned by the time the order to advance came, so he went without them, fighting with roughly 500 men instead of the 640 he should have had.
He had also, earlier in the day, climbed to the top of Big Round Top and seen clearly that placing artillery there would give the Confederates a devastating position. He had sent word up the chain of command suggesting exactly this. The suggestion was ignored. The first assault hit the 20th Maine like a wave.
The Confederates came up through the rocks yelling, firing as they advanced, and the Maine men held their ground and fired back. The hillside was steep, the boulders offered cover to both sides, and the smoke from black powder rifles hung in the air between the trees. Men on both sides went down. The Confederates reached the Union line in places, were thrown back, reformed in the trees below, and came again.
The second assault was harder. Oates shifted his approach, trying to find the left end of the Union line and curl around it. Chamberlain had prepared for this by bending that left flank back. So when the Alabamians tried to swing around the edge, they ran into men who were already facing them.
The fighting became close, loud, and savage. Men fired at targets ten yards away. Officers drew pistols. The 20th Maine’s line bent, but did not break.
The third assault very nearly finished them. By this point, Chamberlain’s men had been fighting for somewhere between fifteen and twenty minutes. The regiment’s line had contracted. Men had been pulled from the right side of the line to reinforce the left, thinning the right to almost nothing.
The ammunition was nearly gone, not running low, nearly gone. The officers were going up and down the line asking men how many rounds they had left. The answer was coming back in ones and zeros. Some men had already resorted to picking up the rifles of the dead and wounded around them and using those until those ran dry, too.
When Chamberlain understood that his regiment had, at best, one more volley in it, he faced a set of options that all looked like different versions of the same catastrophe. He could order a retreat, but retreating from this position meant abandoning the flank, and abandoning the flank meant the Confederates would come around and roll up the entire Union line from below. He could hold the position and fight with whatever was left, rifle butts, bayonets, bare hands. But with hundreds of Confederates still coming, a static defense with no ammunition was a slow way to lose the same ground a retreat would surrender faster.
Or he could attack. Chamberlain would later describe this moment not as inspiration, not as desperation, but as calculation, a cold inventory of options in which attack was the only one that didn’t end in certain defeat. The left flank was bent back at a right angle to the main line. If he ordered both halves of his line to advance simultaneously, the left swinging outward and the right sweeping forward like a closing barn door, the movement would close the distance so quickly that the Confederates, who were themselves in the process of reforming for what they intended to be a final push, would have no time to react.
He gave the order to fix bayonets. Roughly 350 men who had been fighting uphill for twenty minutes with no ammunition drew bayonets and charged downhill into roughly 500 Confederate soldiers who were preparing to attack them. The noise was enormous and sudden. The psychological impact was instant and total.
The Confederates who had expected to come up the hill into defenders who were nearly finished found instead that the hill itself seemed to be coming down at them. Oates’s line collapsed, not slowly, all at once. Men turned and ran, or threw their hands up, or were caught in the sweep. The 20th Maine captured over 100 Confederate prisoners, including several officers, in a matter of minutes.
Oates himself barely escaped. The 20th Maine held the left flank of the Army of the Potomac for the rest of that day and into the third day of the battle. The broader fighting of July 2nd raged on. Sickles’s Third Corps was effectively destroyed in the Peach Orchard and the Wheatfield.
But the Union line held, and it held in part because the anchor at its southern end had not given way. The following day, July 3rd, Pickett’s Charge saw 15,000 Confederate soldiers walking across an open mile of ground into concentrated Union artillery and rifle fire. Lee’s great gamble on the Union center had failed to break the line. The Army of Northern Virginia began its long retreat back to Virginia in the rain.
Lee would never invade the North again. The connection between Little Round Top on the second day and Pickett’s Charge on the third is not incidental. Had the Confederate Army taken Little Round Top on the afternoon of July 2nd, there would have been no intact Union line to charge on the third. Meade would have had to abandon the field with a battered, demoralized army.
The political consequences are almost impossible to overstate. A decisive Confederate victory at Gettysburg would have given the peace Democrats, the Copperheads, exactly the argument they needed. Lincoln might not have survived the 1864 election. The war might have ended on Confederate terms before the year was out.
Military historians, including ones deeply skeptical of counterfactual arguments, have consistently pointed to the Union’s hold on Little Round Top as one of the genuine hinge moments of the entire conflict. What Chamberlain and his men did in those twenty minutes was load-bearing. The whole structure of the Union war effort rested, for those twenty minutes, on a rocky hillside in Pennsylvania with a professor and 386 men who had run out of bullets. Joshua Chamberlain went on to fight through nearly every major engagement of the Army of the Potomac for the rest of the war.
He was wounded six times, once so severely at Petersburg in 1864 that Ulysses Grant promoted him to Brigadier General on the spot, believing he was dying. He didn’t die. At Appomattox in April 1865, Grant selected him to command the Union forces that formally received the Confederate surrender. Chamberlain, without orders and entirely on his own initiative, commanded his men to present arms as the Confederate soldiers marched past, a military salute to men who had fought honorably.
Confederate General John Gordon, who was leading the marching troops, saw the gesture and ordered his own men to return it. After the war, Chamberlain went back to Maine. He became governor four times. He became president of Bowdoin College for twelve years.
He wrote extensively about the war. The Petersburg wound never fully healed, and he underwent more than a dozen surgeries over the following decades. He died in 1914 at the age of eighty-five, reportedly still suffering from that wound fifty years later. The monument to the 20th Maine still stands on Little Round Top.
It sits near the spot where Chamberlain bent his left flank back. The boulders are still there. The slope is still steep. What the monument can’t show is the interior of that decision: the moment when a man with no ammunition, responsible for holding the flank of an entire army, looked at his options and chose the one that looked like madness but was actually the only geometry that worked.
There are moments in history that feel retrospectively inevitable. Little Round Top is not one of them. It was genuinely contingent. If Warren hadn’t ridden up that hill to check the ground, if Vincent hadn’t moved without waiting for orders, if Chamberlain had decided the only rational response to running out of ammunition was to fall back and save his men, the hill falls.
Instead, a former rhetoric professor from Maine looked down a rocky Pennsylvania hillside at an enemy force larger than his own, turned to his officers, and ordered the charge. The Army of the Potomac held. Gettysburg held. The Union held.
Twenty minutes, 386 men. One decision made by a man who had never heard of Little Round Top before the day he was ordered to die on it. That is how close it was.