Lincoln Assassination: Wider Conspiracy

Overview

The assassination of Abraham Lincoln on April 14, 1865, is the most thoroughly documented political conspiracy in 19th-century American history — and one of the rare cases where the word “conspiracy” is not contested by anyone. This was not the act of a lone gunman. It was a coordinated plot to decapitate the entire leadership of the United States government in a single evening: Booth would kill the president, Lewis Powell would kill the secretary of state, and George Atzerodt would kill the vice president. Two of the three attacks were carried out. The conspiracy was proven at trial, the conspirators were executed or imprisoned, and the basic facts have been established beyond dispute for over 160 years.

What remains actively debated — and what makes the Lincoln assassination a living historical question rather than a closed case — is how far the conspiracy extended. The confirmed cell of conspirators numbered at least eight. But did their plan originate with, or receive authorization from, the Confederate government of Jefferson Davis? Was the assassination the final operational expression of the Confederate Secret Service, which had been running intelligence and sabotage operations from Canada throughout the war? Did Secretary of War Edwin Stanton — who controlled much of the investigation and prosecution — have his own agenda in shaping the narrative of the conspiracy? And what role did the broader networks of Confederate sympathy in Washington, Maryland, and Virginia play in enabling Booth’s plot and facilitating his escape?

These questions have generated 160 years of scholarship, several competing schools of interpretation, and a secondary literature that is itself one of the most extensive in American historical writing.

Origins & History

From Kidnapping to Murder

The assassination began as something less: a kidnapping plot. Understanding this evolution is essential to understanding the conspiracy’s structure and the debate about its ultimate authorship.

John Wilkes Booth (1838-1865) was one of the most recognizable men in America. The son of the legendary English-born actor Junius Brutus Booth and brother of Edwin Booth (considered the greatest American actor of the era), John Wilkes was a star in his own right — a matinee idol whose performances drew packed houses across the country. He was also a passionate Confederate sympathizer who viewed the war as a righteous struggle against tyrannical Northern aggression and Lincoln as the embodiment of everything wrong with the Union.

In the summer of 1864, with the war still raging and Confederate military fortunes declining sharply after Gettysburg and Vicksburg, Booth conceived a plan to kidnap President Lincoln and transport him to Richmond, the Confederate capital. The purpose was strategic: Lincoln would be held hostage in exchange for the release of Confederate prisoners of war, tens of thousands of whom were being held in Union camps under increasingly desperate conditions. The prisoner-of-war exchange system had broken down in 1863, and the Confederacy desperately needed its captured soldiers back.

Booth began recruiting co-conspirators through late 1864 and into early 1865. The cell he assembled reflected the diverse social margins of Civil War-era Washington:

• Lewis Thornton Powell (also known as Lewis Payne), a former Confederate soldier from Florida who had been wounded at Gettysburg and drifted through Confederate intelligence circles. Powell was physically imposing — over six feet tall and powerfully built — and unquestioningly loyal to Booth.

• George Andrew Atzerodt, a German-born carriage maker from Port Tobacco, Maryland, who knew the hidden routes, safe houses, and river crossings of the Maryland escape network used by Confederate agents and smugglers.

• David Edgar Herold, a young pharmacy clerk with limited intelligence but an encyclopedic knowledge of the rural roads, farms, and sympathizers south of Washington — essential for any escape route through Southern Maryland.

• Samuel Arnold and Michael O’Laughlen, childhood friends of Booth from Baltimore, recruited for the kidnapping but increasingly ambivalent as the plan evolved.

• John Harrison Surratt Jr., a 21-year-old Confederate courier who had been carrying dispatches and intelligence between Washington, Richmond, and the Confederate agents operating from Canada. Surratt was the most directly connected to the Confederate intelligence apparatus.

The conspirators met frequently at the H Street boarding house operated by Mary Surratt, John’s mother. The boarding house became the operational hub — a place where plans were discussed, weapons were stored, and messages were relayed.

The Failed Kidnapping

The kidnapping attempt came on March 17, 1865, when Booth received intelligence that Lincoln would attend a performance at the Campbell Hospital on the outskirts of Washington. The conspirators positioned themselves along the intended route, prepared to intercept the presidential carriage, overpower the guards, and spirit Lincoln south through Maryland to a waiting boat on the Potomac.

Lincoln did not come. He had changed his plans and attended a different event. The abduction plot collapsed into embarrassment and recrimination. Arnold and O’Laughlen effectively withdrew from the conspiracy, telling Booth they were done.

Then the war ended. Richmond fell on April 3. Lee surrendered at Appomattox on April 9. The strategic rationale for kidnapping Lincoln — exchanging him for prisoners — evaporated. There was no more Confederacy to negotiate with. There were no more prisoner-of-war exchanges to demand.

For most of the conspirators, the end of the war meant the end of the plot. For Booth, it meant escalation.

April 14, 1865

On April 14, Booth learned that Lincoln would attend the comedy Our American Cousin at Ford’s Theatre that evening, accompanied by his wife Mary Todd Lincoln and guests Major Henry Rathbone and Clara Harris. Booth knew Ford’s Theatre intimately — he had performed there many times and had his mail delivered there. He knew its layout, its entrances, its backstage passages.

Within hours, Booth improvised a new plan. It was no longer a kidnapping. It was a coordinated assassination of the three highest-ranking officials of the U.S. government:

• Booth would kill President Lincoln at Ford’s Theatre
• Lewis Powell would kill Secretary of State William Seward at his home on Lafayette Square
• George Atzerodt would kill Vice President Andrew Johnson at the Kirkwood House hotel

The attacks were to be simultaneous — approximately 10:15 PM — to prevent any warning from reaching subsequent targets.

At approximately 10:13 PM, Booth entered the presidential box at Ford’s Theatre through a door he had prepared earlier that day, wedging it to prevent anyone from following him in. He shot Lincoln behind the left ear with a .44 caliber single-shot Philadelphia Derringer at point-blank range. Major Rathbone lunged at Booth, who slashed him across the arm with a hunting knife. Booth then leapt from the box to the stage — a drop of approximately twelve feet — catching his spur on the flag draping the box and landing awkwardly. He broke the fibula of his left leg (though some accounts dispute whether the break occurred during the jump or later during his escape). Despite the injury, Booth crossed the stage, shouted what witnesses variably recalled as “Sic semper tyrannis” (“Thus always to tyrants,” the Virginia state motto) or “The South is avenged!” and exited through the stage door to a waiting horse.

Lincoln never regained consciousness. He was carried across the street to the Petersen boarding house, where he died at 7:22 AM on April 15, 1865.

The Simultaneous Attacks

Powell’s attack on Secretary Seward was ferocious and nearly successful. Seward was bedridden in his home, recovering from a serious carriage accident nine days earlier that had broken his jaw. Powell, posing as a pharmacy messenger delivering medicine, forced his way past Seward’s son Frederick (whom he pistol-whipped, fracturing his skull) and burst into the secretary’s bedroom. He stabbed Seward repeatedly with a large Bowie knife, slashing his face and neck. Seward survived only because the metal jaw splint he wore from his accident deflected the knife from his jugular vein. Powell also stabbed or injured four other people in the house — Seward’s sons Augustus and Frederick, a State Department messenger named Emerick Hansell, and Sergeant George Robinson, a nurse — before fleeing into the night.

Atzerodt’s assignment was the simplest and arguably the most important: walk into the Kirkwood House hotel, find Vice President Andrew Johnson’s room, and kill him. Atzerodt had checked into the hotel earlier that day. But when the appointed hour came, Atzerodt lost his nerve entirely. He went to the hotel bar, drank himself into a stupor, and wandered away without making any attempt on Johnson’s life. His failure to act meant that the line of presidential succession remained intact — a failure that would shape the course of Reconstruction.

The Manhunt and Death of Booth

Booth fled south from Ford’s Theatre on horseback, crossing the Navy Yard Bridge over the Anacostia River. David Herold, who had been assigned to guide Powell to Seward’s home but abandoned him during the attack, caught up with Booth south of the city. The two rode through Southern Maryland, following a pre-established escape route used by Confederate couriers and agents. They stopped at the Surratt tavern in Surrattsville (now Clinton), Maryland, to retrieve supplies that Mary Surratt had — according to testimony — arranged to have ready. They then sought medical attention from Dr. Samuel Mudd, who set Booth’s broken leg, and continued south through a network of Confederate sympathizers who sheltered them as they crossed the Potomac into Virginia.

For twelve days, the largest manhunt in American history to that point consumed the resources of the federal government. Secretary of War Edwin Stanton coordinated the search, deploying thousands of troops and offering a $100,000 reward (equivalent to over $2 million today).

On April 26, Union cavalry cornered Booth and Herold in a tobacco barn on the Garrett farm near Port Royal, Virginia. Herold surrendered. Booth refused to come out. The soldiers set fire to the barn. As flames engulfed the structure, Sergeant Boston Corbett fired a single shot through a gap in the boards, striking Booth in the neck. Booth was dragged from the burning barn, paralyzed. His last reported words — “Tell my mother I die for my country… Useless, useless” — came as he died on the porch of the Garrett farmhouse at approximately 7:00 AM.

Key Claims

• Confirmed multi-conspirator plot: At least eight individuals were tried by military tribunal for their roles in a coordinated plan to kill Lincoln, Seward, and Johnson simultaneously — this is established fact, not theory
• Confederate Secret Service involvement: Evidence links several conspirators, particularly John Surratt Jr., to Confederate intelligence operations run from Canada by agents including Jacob Thompson and Clement Clay
• Jefferson Davis’s complicity: The Union government formally charged Confederate President Jefferson Davis with directing the assassination, though he was never tried on these charges and they were eventually dropped
• Mary Surratt’s boarding house as operational hub: The conspirators regularly met at Mary Surratt’s H Street establishment; testimony indicated she was aware of and facilitated the plot
• Pre-established Confederate escape route: Booth’s flight south followed routes used by Confederate couriers and intelligence operatives, suggesting infrastructure maintained by a network broader than Booth’s immediate cell
• The Stanton theory: A persistent minority theory holds that Secretary of War Edwin Stanton either allowed or actively facilitated the assassination to prevent Lincoln’s lenient Reconstruction policies and install a more radical government
• Evolution from kidnapping to murder: The plot began as a prisoner-exchange kidnapping scheme before escalating to assassination after the Confederacy’s military collapse — the question is whether Booth made this escalation independently or with authorization
• John Surratt Jr.’s international escape: Surratt’s flight to Canada, England, and the Papal States suggests a support network with international reach

Evidence

The Military Tribunal

The evidence for the core conspiracy was presented at the military tribunal convened in May-June 1865. Eight defendants — Powell, Atzerodt, Herold, Mary Surratt, Arnold, O’Laughlen, Dr. Samuel Mudd, and Edman Spangler (a stagehand at Ford’s Theatre who had held Booth’s horse) — were tried before a nine-member military commission appointed by President Andrew Johnson.

The prosecution, led by Judge Advocate General Joseph Holt, called 366 witnesses over the course of seven weeks. The volume of testimony was extraordinary for the era and produced a trial record that remains one of the most detailed legal proceedings of the 19th century.

Key testimony came from:

• Louis Weichmann, a War Department clerk and boarder at the Surratt house, who described meetings between Booth and the conspirators, suspicious late-night conversations, and trips by Mary Surratt to her tavern in Surrattsville on April 14 — the day of the assassination — that he believed were related to the escape plan.

• John Lloyd, who rented Mary Surratt’s tavern in Surrattsville. Lloyd testified that Mary Surratt visited the tavern on April 14 and instructed him to have “shooting irons” (two Spencer carbines hidden earlier by Surratt Jr. and Atzerodt) ready for pickup that night. This testimony was pivotal to Mary Surratt’s conviction, though Lloyd was drunk at the time of the events he described and may have been pressured by investigators.

• Various witnesses to the actual attacks, whose testimony established the movements and actions of Booth, Powell, and Atzerodt on the night of April 14.

Physical evidence included the Derringer pistol used to shoot Lincoln (recovered from the presidential box), Booth’s diary (found on his body, containing entries justifying his actions as service to the Confederacy), correspondence linking conspirators to Confederate agents in Canada, and the Spencer carbines and other supplies cached along the escape route.

The Confederate Government Question

The evidence for broader Confederate government involvement is more contested and has divided historians for over a century.

Evidence supporting Confederate involvement:

The tribunal heard testimony, some of it from perjured witnesses, claiming that Jefferson Davis had approved the assassination. Sanford Conover (real name Charles Dunham) testified that he had overheard Confederate leaders discussing plans to kill Lincoln. Conover’s testimony was later exposed as perjury — he had fabricated witnesses and coached them — and he was eventually convicted of suborning perjury and imprisoned.

More credible evidence links the conspiracy to the Confederate intelligence network operating from Canada. Confederate agents Jacob Thompson and Clement Clay, operating from Montreal and Toronto with the knowledge and funding of the Confederate government, had organized a range of covert operations against the Union, including an attempt to burn New York City (November 1864), a raid on St. Albans, Vermont (October 1864), and plots to introduce biological agents (specifically yellow fever-contaminated clothing) into Northern cities. Thompson had provided funding to Booth, though whether the funds were intended for the kidnapping plot (which had Confederate strategic value) or the assassination (which did not) is precisely the question historians cannot answer with certainty.

John Surratt Jr.’s deep involvement in Confederate courier operations — carrying dispatches between Washington, Richmond, and Canada — establishes that at least one member of Booth’s cell was an active Confederate agent, not merely a sympathizer. Surratt’s flight after the assassination — to Montreal, then to England, then to the Papal States, where he enlisted in the Papal Zouaves under an assumed name before being recognized and extradited — suggests a support network with international reach.

Evidence against direct Confederate authorization:

Several prominent Civil War historians, including James McPherson and William Hanchett, have argued that Booth escalated from kidnapping to assassination on his own initiative after the Confederacy’s surrender made kidnapping pointless. In this interpretation, the Confederate government may have authorized the kidnapping — which served a legitimate military purpose — but never sanctioned assassination, which served no strategic purpose and was certain to bring catastrophic retribution upon the defeated South.

Davis was formally charged with complicity in the assassination but was never tried. The charges were quietly dropped in 1869, partly because the government’s evidence (particularly after Conover’s perjury was exposed) was insufficient for a civilian trial and partly because a trial would have forced the government to either prove or publicly fail to prove the most explosive charge of the Civil War era.

The Stanton Theory

A minority but persistent theory holds that Secretary of War Edwin Stanton was complicit in Lincoln’s death — that he either deliberately left Lincoln unprotected or actively facilitated the assassination to prevent Lincoln from implementing the lenient Reconstruction policies he had outlined publicly.

The theory was popularized by Otto Eisenschiml’s 1937 book Why Was Lincoln Murdered?, which raised questions about Stanton’s actions on the night of April 14: Why was the president’s security detail so thin? Why did Stanton initially refuse to allow the Army to pursue Booth (a claim disputed by other sources)? Why was Booth’s diary found with pages missing when it was turned over to the War Department?

The Stanton theory has been rejected by most mainstream historians, including Edward Steers Jr. and Michael Kauffman, who have documented that Lincoln’s security was inadequate on many occasions (not specifically on April 14), that Stanton organized the manhunt with genuine urgency, and that the missing diary pages likely contained entries unrelated to the assassination that were removed to protect the reputations of named individuals.

Cultural Impact

Legal Precedents

The Lincoln assassination conspiracy and its aftermath established legal and political templates that resonate to the present day.

The use of a military tribunal to try civilians — including Mary Surratt, a private citizen with no military commission — was controversial in 1865 and remains so. Booth’s co-conspirators were tried by military commission rather than civilian court on the grounds that the assassination was an act of war committed in a military theater. Critics argued then, and argue now, that the defendants were entitled to civilian trial protections, including a jury of peers. The precedent was cited in debates over military tribunals at Guantanamo Bay following the September 11 attacks.

The execution of Mary Surratt — the first woman executed by the U.S. federal government — was deeply controversial. Five of the nine tribunal members signed a clemency petition recommending that her sentence be commuted to life imprisonment. President Andrew Johnson later claimed he never saw the petition; Judge Advocate General Holt maintained that he presented it personally. The dispute has never been resolved. Surratt’s execution raised questions about proportionality (was operating a boarding house where conspirators met equivalent to carrying out the attacks?), about gender and justice, and about whether she was punished partly in place of her son John, who had escaped.

The Lone Gunman Debate Template

The Lincoln assassination established the debate template that would recur with every subsequent political assassination in American history: Was the act the work of a lone individual, or the visible edge of a larger conspiracy? The confirmed existence of Booth’s cell — and the unanswered questions about Confederate and governmental involvement — created the conceptual framework within which the JFK assassination, the MLK assassination, the RFK assassination, and others would be analyzed.

The specific pattern — a confirmed core conspiracy with debated connections to larger structures — mirrors the analytical structure applied to virtually every major assassination since 1865. In each case, there is a confirmed perpetrator, a question of whether the perpetrator acted alone or with support, and a secondary question of whether powerful institutions either authorized the act, facilitated it through negligence, or shaped the investigation to serve their own interests.

Popular Culture

The Lincoln assassination has inspired an enormous body of creative work, from the stage play and Robert Redford’s 2010 film The Conspirator (which focused on the trial of Mary Surratt) to novels, documentaries, and museum exhibitions. Ford’s Theatre itself continues to operate as both a functioning theatre and a National Historic Site, with a museum dedicated to the assassination. The route of Booth’s twelve-day escape through Southern Maryland is now a heritage trail maintained by the Surratt Society.

The story retains its power because it combines elements of a political thriller, a legal drama, a military manhunt, and a moral argument about justice, vengeance, and the consequences of civil war — all set against the most dramatic backdrop in American history: the final week of the Civil War and the death of the president who ended slavery.

Key Figures

• John Wilkes Booth (1838-1865) — Actor and Confederate sympathizer who organized the conspiracy, evolving it from a kidnapping plot to a coordinated assassination. Shot Lincoln at Ford’s Theatre and was killed twelve days later by Sergeant Boston Corbett.

• Lewis Powell (1844-1865) — Former Confederate soldier who attacked Secretary of State William Seward, stabbing him and four others. Executed by hanging on July 7, 1865.

• George Atzerodt (1835-1865) — German-born carriage maker assigned to assassinate Vice President Andrew Johnson but who failed to act. Executed by hanging on July 7, 1865.

• David Herold (1842-1865) — Pharmacy clerk who guided Booth through the Maryland escape route and was captured with him at the Garrett farm. Executed by hanging on July 7, 1865.

• Mary Surratt (1823-1865) — Owner of the H Street boarding house where the conspirators met. First woman executed by the U.S. federal government. Her execution remains controversial.

• John Surratt Jr. (1844-1916) — Confederate courier and conspirator who fled after the assassination, was eventually captured in Egypt, and was tried in civilian court in 1867. The trial ended in a hung jury; he was never retried.

• Dr. Samuel Mudd (1833-1883) — Maryland physician who treated Booth’s broken leg during his escape. Convicted and sentenced to life imprisonment; pardoned by President Johnson in 1869. His guilt or innocence remains debated.

• Jefferson Davis (1808-1889) — President of the Confederate States. Initially charged with complicity in the assassination but never tried; charges dropped in 1869.

• Edwin Stanton (1814-1869) — Lincoln’s Secretary of War who coordinated the manhunt and shaped the prosecution. Subject of a persistent but largely discredited theory of complicity.

• Jacob Thompson (1810-1885) — Confederate agent operating from Canada who provided funding to Booth. Whether the funding was for kidnapping or assassination is disputed.

Timeline

• Summer 1864 — Booth conceives plan to kidnap Lincoln and exchange him for Confederate prisoners
• Late 1864-Early 1865 — Booth recruits Powell, Atzerodt, Herold, Arnold, O’Laughlen, and John Surratt Jr.; group meets at Mary Surratt’s boarding house
• March 17, 1865 — Kidnapping attempt fails when Lincoln changes his schedule
• April 3, 1865 — Richmond falls to Union forces
• April 9, 1865 — Lee surrenders at Appomattox Court House
• April 14, 1865 — Booth learns Lincoln will attend Ford’s Theatre; improvises assassination plan
• ~10:13 PM, April 14 — Booth shoots Lincoln at Ford’s Theatre
• ~10:15 PM, April 14 — Powell attacks Secretary Seward at his home; Atzerodt fails to attack Vice President Johnson
• 7:22 AM, April 15 — Lincoln dies at the Petersen house across from Ford’s Theatre
• April 15-26 — Largest manhunt in American history; Booth and Herold flee through Maryland into Virginia
• April 26, 1865 — Booth killed and Herold captured at the Garrett farm near Port Royal, Virginia
• May 1-June 30, 1865 — Military tribunal tries eight conspirators; 366 witnesses testify
• July 7, 1865 — Powell, Atzerodt, Herold, and Mary Surratt executed by hanging at the Washington Arsenal
• 1867 — John Surratt Jr. captured and tried in civilian court; hung jury; never retried
• 1869 — Charges against Jefferson Davis dropped; Dr. Samuel Mudd pardoned
• 1937 — Otto Eisenschiml publishes Why Was Lincoln Murdered?, popularizing the Stanton theory
• 1995 — Dr. Mudd’s descendants petition the Army Board for Correction of Military Records; petition denied
• 2004 — Michael Kauffman publishes American Brutus, the most comprehensive modern biography of Booth
• 2006 — James Swanson publishes Manhunt, bringing the twelve-day chase to a mass audience
• 2010 — Robert Redford’s The Conspirator dramatizes the Mary Surratt trial

Sources & Further Reading

• Swanson, James L. Manhunt: The 12-Day Chase for Lincoln’s Killer. William Morrow, 2006.
• Kauffman, Michael W. American Brutus: John Wilkes Booth and the Lincoln Conspiracies. Random House, 2004.
• Steers, Edward Jr. Blood on the Moon: The Assassination of Abraham Lincoln. University Press of Kentucky, 2001.
• Larson, Kate Clifford. The Assassin’s Accomplice: Mary Surratt and the Plot to Kill Abraham Lincoln. Basic Books, 2008.
• Pitman, Benn, comp. The Assassination of President Lincoln and the Trial of the Conspirators. Moore, Wilstach & Baldwin, 1865 (trial transcripts).
• Eisenschiml, Otto. Why Was Lincoln Murdered? Halcyon House, 1937.
• Chamlee, Roy Z. Lincoln’s Assassins: A Complete Account of Their Capture, Trial, and Punishment. McFarland, 1990.
• Hanchett, William. The Lincoln Murder Conspiracies. University of Illinois Press, 1983.
• Tidwell, William A., et al. Come Retribution: The Confederate Secret Service and the Assassination of Lincoln. University Press of Mississippi, 1988.

Related Theories

• JFK Assassination
• MLK Assassination
• RFK Assassination
• CIA-Kennedy Plot