On the morning of July 3, 1863, at Gettysburg, Confederate General George Pickett prepared roughly 15,000 men from Virginia, North Carolina, and Tennessee for an assault that would become one of the most infamous episodes of the American Civil War. They were ordered to advance across nearly a mile of open ground, walking shoulder to shoulder in neat lines at a steady pace, straight into the massed artillery and rifle fire of Union forces positioned on Cemetery Ridge. They were told not to run and not to scatter. They were to march deliberately into a killing zone.
The question that has haunted military historians ever since is why. Why would farmers, clerks, and laborers turned soldiers obey such an order, knowing the likely cost? The answer lies not in blind obedience but in the strategic, psychological, and technological realities of nineteenth-century warfare. To understand the logic of linear tactics, one must look back to the battlefields of the eighteenth century.
The standard infantry weapon of that era, the smoothbore musket, was wildly inaccurate beyond roughly fifty yards. Fired individually, such a weapon was nearly useless. But massed together in dense formations, three ranks deep, soldiers could deliver volleys that saturated an enemy line with hundreds of balls at once. This style of warfare, perfected by figures like Frederick the Great of Prussia, demanded rigid discipline.
Armies drilled endlessly so that men could maintain formation under fire, because breaking ranks invited disaster. Gaps in a line could be exploited by cavalry charges, and scattered troops could not be commanded effectively amid the noise and chaos of battle. Officers needed compact formations to see their men, issue orders, and coordinate movements across a battlefield. One Napoleonic-era manual captured the spirit of the age in a single grim sentence: the soldier must fear his officers more than the enemy.
This inherited doctrine carried directly into the American Civil War, which broke out in 1861 over the intertwined issues of slavery, states’ rights, and the preservation of the Union. Both Union and Confederate armies operated under the same tactical manuals, most notably Winfield Scott’s infantry regulations, which were modeled on French military doctrine. The prescribed method of attack was straightforward: advance in line, halt to fire by rank, then press forward. Generals on both sides had been trained on these principles and saw no compelling reason to abandon them.
But by the time the war began, the technology that had justified linear tactics was already obsolete. The smoothbore musket had been replaced by rifled muskets such as the Springfield Model 1855 and the British Enfield, both capable of accurate fire out to three or four hundred yards. A soldier could now be killed at distances where a smoothbore round would have fallen harmlessly short. The question becomes sharper: why continue using formations designed for weapons that no longer existed?
Several factors explain the persistence of the line. The first was psychological. Soldiers in a dense formation drew courage from the presence of their comrades. The line created a sense of shared fate that could override individual terror.
It also made desertion difficult, both practically and socially. Peer pressure and the threat of execution for cowardice kept men moving forward even when every instinct screamed at them to run. Union soldier Elisha Hunt Rhodes recorded his own experience after the Battle of Antietam, describing how the men advanced in line of battle while keeping up a brisk fire. He noted the pity of killing such brave men, but acknowledged the necessity of the act.
The formation turned fear into a grim, fatalistic resolve. The second reason was command and control. Generals such as Robert E. Lee and Ulysses S.
Grant commanded armies of tens of thousands of men spread over miles of terrain. Without radios, and with couriers unreliable under fire, visibility was the only reliable way to coordinate an attack. A compact line allowed senior officers on horseback to see weaknesses in the enemy position, rally wavering troops, and direct the momentum of an assault. Loose skirmish formations, useful for harassment, lacked the mass needed to break a determined defensive line.
Running, meanwhile, was actively discouraged. Soldiers in wool uniforms under the southern sun would arrive exhausted and disorganized at the enemy position, where bayonets and close-quarters fighting would decide the outcome. The deliberate pace preserved energy and order for that final, decisive push. Bayonets themselves played a role, though not the one often assumed.
Reloading a rifled musket took twenty to thirty seconds, requiring the soldier to ram powder, ball, and cap down the barrel. In that window, an advancing line could close the distance and reach the enemy before a second volley could be fired. In practice, bayonet wounds accounted for only about one percent of all casualties in the war. But the threat of the bayonet was enough to keep men standing and fighting rather than fleeing, and it gave the walking line its strategic purpose.
As Confederate officer Moxley Sorrel recalled of the advance at Gettysburg, the line moved forward at common time, no double quick, saving their strength for the supreme moment. The cost of these tactics was staggering. At Fredericksburg in December 1862, Union General Ambrose Burnside sent wave after wave of infantry against Confederate positions behind a stone wall on Marye’s Heights. The Irish Brigade marched uphill into canister fire, the artillery equivalent of a giant shotgun blast.
One survivor described the air as seeming filled with lead, with men falling like leaves in autumn. Over twelve thousand Union soldiers became casualties in a matter of hours, most of them killed or wounded while advancing in formation into concentrated fire. Adaptation did occur, but slowly. As the war ground on, the enthusiasm for linear tactics faded in the face of mounting casualties.
By 1864, entrenchments had become standard, with siege lines at Petersburg foreshadowing the trench warfare of the First World War. Skirmishers screened advances and used cover such as trees and fences. But wholesale change was resisted for practical reasons. The armies were composed largely of volunteers with only weeks of drill, and retraining them for a completely new style of combat was not feasible.
Generals, moreover, clung to the doctrines that had produced celebrated victories in the past, such as Napoleon’s triumph at Austerlitz. Terrain also complicated the picture. Many Civil War battlefields were wooded or rolling, which limited the effective range of rifles and broke formations into chaos regardless. At Shiloh in 1862, dense forests made linear control nearly impossible.
And while cavalry had been diminished by the increased range of infantry fire, it still posed a real threat to exposed flanks, meaning that open-order tactics invited encirclement. The historian Paddy Griffith has argued that the Civil War was less revolutionary than sometimes claimed, noting that effective fire rates were low due to smoke, stress, and poor marksmanship. Soldiers frequently fired high, or did not fire at all under the pressure of battle. The human dimension of these tactics is best captured in the accounts of the men who lived through them.
Private Sam Watkins of the Confederate Army of Tennessee described in his memoir, Company Aytch, the experience of advancing at Chickamauga, with balls whistling around the ears of the men and hundreds being shot. Watkins survived multiple charges, attributing his survival to luck and to the hypnotic pull of the line, the feeling of being part of something larger, where to stop would be to betray it all. On the Union side, Oliver Wendell Holmes Jr. , who was wounded three times and later served on the Supreme Court, reflected on the meaning of those years in a single memorable phrase: in our youths, our hearts were touched with fire.
That fire forged bonds between men even as it destroyed their bodies. The consequences extended far beyond the battlefields, as nurses such as Clara Barton, who treated the wounded at Antietam, confronted the mangled results of these tactics amid fields turned red. The generals have often been condemned as butchers. Lee’s aggressiveness at Gettysburg and Grant’s attritional assaults at Cold Harbor are cited as proof of tactical blindness.
But they operated within the limits of their era. Grant used railroads to keep his armies supplied, and Lee maneuvered with skill throughout the war. The scale of the conflict demanded decisive battles, and the line remained the only reliable instrument for achieving a breakthrough. The war’s final campaigns reflected this evolution.
Sherman’s march through Georgia in 1864 emphasized mobility over direct confrontation, but when battle was joined, the formations persisted. The war ended at Appomattox in April 1865, but the tactical debate did not. In retrospect, the cost and the outcome remain intertwined. Linear tactics helped win the war for the Union through persistence and mass, but the price was measured in hundreds of thousands of dead.
The conflict stood on the cusp of a new era, with rifles displacing muskets and industrial slaughter beginning to replace the rituals of an older military world. The trenches of the First World War, amplified by machine guns, would echo the tragedy on an even larger scale. The generals of the Civil War were not merely tacticians. They were men gambling lives on doctrines that had already become outdated, knowing that the new firepower had turned valor into massacre.
For the soldiers who marched into those fields, the line offered both a shared identity and a shared grave. The ghosts of Gettysburg still pose the question of whether those marches were folly or the only path available to end slavery and preserve the Union. The answer, like the war itself, carries no easy resolution.