Ex parte Merryman was an 1861 ruling by Chief Justice Roger B. Taney holding that only Congress, not the president, could suspend the writ of habeas corpus during a rebellion. President Abraham Lincoln ignored the order. The military commander at Fort McHenry refused to produce the prisoner, John Merryman, and armed guards turned away the federal marshal who came to serve a contempt attachment. The case became one of American law’s most cited confrontations between judicial authority and executive power, and it remains unresolved by the Supreme Court to this day.
Who John Merryman Was and Why He Was Arrested
John Merryman was a wealthy Baltimore County planter, a state legislator, and a lieutenant in the Baltimore County Horse Guards. In the days after Confederate forces fired on Fort Sumter, Maryland officials worked to keep Union reinforcements out of Washington. A city militia unit and roughly sixty Baltimore police officers burned railroad bridges north of the city and cut telegraph lines, isolating the capital.1Maryland State Archives. Straddling Secession – Burning the Bridges The Horse Guards burned additional bridges between Cockeysville and the Pennsylvania line, and Merryman was among those responsible.
At 2:00 a.m. on May 25, 1861, federal troops entered Merryman’s country home, Hayfields, and arrested him. He was taken to Fort McHenry and held on suspicion of participating in the bridge burnings, recruiting soldiers for the Confederacy, and possessing federal arms intended for use against the government.2Federal Judicial Center. Ex parte Merryman and Debates on Civil Liberties During the Civil War He was not charged in any civilian court.
Lincoln’s Suspension of Habeas Corpus
Habeas corpus is the legal right to challenge your detention before a judge. Suspending it means the government can hold people indefinitely without bringing them to court. The Constitution permits suspension only “in Cases of Rebellion or Invasion” when “the public Safety may require it,” but the text does not specify which branch of government holds that power.3Constitution Annotated. Article I Section 9 Clause 2 – Habeas Corpus
On April 27, 1861, a month before Merryman’s arrest, Lincoln authorized General Winfield Scott to suspend the writ along the military corridor between Philadelphia and Washington.4U.S. Capitol – Visitor Center. Order from President Abraham Lincoln to General Winfield Scott Suspending the Writ of Habeas Corpus Congress was not in session. Lincoln’s administration argued that his duty to preserve the Union and his role as commander-in-chief justified acting alone when bridges were burning and the legislature was unavailable. The initial suspension was narrow. By September 1862, a broader proclamation extended it nationwide, subjecting anyone who aided the rebellion or discouraged enlistments to martial law and military tribunals.5The American Presidency Project. Proclamation 94 – Suspending the Writ of Habeas Corpus
Taney’s Ruling
Merryman’s lawyers filed a petition for habeas corpus with Chief Justice Roger B. Taney, who was also the presiding judge of the federal circuit court in Maryland. Taney issued a writ directing General George Cadwalader, the commander at Fort McHenry, to produce Merryman in court and justify his detention.6Teaching American History. Ex Parte Merryman
Taney’s reasoning was structural. The Suspension Clause appears in Article I, which defines the powers of Congress, not in Article II, which covers the presidency. If the framers had intended the president to hold this power, he wrote, they would have placed it in Article II. He ruled that Lincoln’s suspension was unconstitutional. No president could authorize a military officer to arrest citizens without a judicial warrant or hold them without charges. Allowing one branch to control both the military and the suspension of civil liberties, Taney warned, would replace republican government with military rule.2Federal Judicial Center. Ex parte Merryman and Debates on Civil Liberties During the Civil War
One technical point shaped the ruling’s later weight. Taney heard the case “at chambers” under the authority granted to individual Supreme Court justices by the Judiciary Act of 1789, not as part of the full Supreme Court. Merryman was never a Supreme Court decision in the formal sense, which limited its precedential force even as it became one of the most cited opinions in American constitutional law.
The Standoff at Fort McHenry
General Cadwalader refused to produce Merryman. When a federal marshal arrived at Fort McHenry to serve the writ, an aide informed him that the president had authorized Cadwalader to suspend habeas corpus at his discretion. Taney then issued an attachment for contempt of court against Cadwalader. When the marshal returned to serve it, armed guards at the fort’s gate refused him entry.
Taney acknowledged openly that the judiciary had no way to force compliance. Without cooperation from the executive branch, a court order was just paper. He wrote up his full opinion and had it delivered to Lincoln, calling on the president to fulfill his constitutional duty to enforce the laws. Lincoln did not respond directly. The standoff exposed a hard truth about the constitutional design: checks and balances depend on each branch choosing to respect the others, and the branch with the army has no institutional superior to answer to when it declines.
Lincoln’s Answer to Congress
On July 4, 1861, with Congress finally in special session, Lincoln addressed the controversy. His argument was practical rather than legalistic. He framed the question as a choice between enforcing one constitutional provision and losing the entire government: “Are all the laws but one to go unexecuted, and the Government itself go to pieces, lest that one be violated?”7The American Presidency Project. Special Session Message
The rebellion had already made federal law unenforceable across nearly a third of the states, Lincoln argued, and allowing the government to collapse out of deference to habeas corpus would violate his oath more gravely than temporarily suspending the writ. He also pushed back on Taney’s structural argument. The Constitution says the writ “shall not be suspended, unless” certain conditions are met, which Lincoln read as a grant of power to suspend when those conditions exist, not a restriction assigning that power to Congress alone. The war-power, he said, had been “forced upon him,” and he described the suspension as having been exercised “but very sparingly.”7The American Presidency Project. Special Session Message
Notably, Lincoln never directly claimed the Constitution gave the president suspension power. He argued instead that someone had to act, Congress was absent, and the alternative was dissolution of the Union. Congress largely accepted the argument.
The Habeas Corpus Act of 1863
Congress settled the immediate question legislatively. On March 3, 1863, it passed the Habeas Corpus Act, formally authorizing the president to suspend the writ “in any case throughout the United States, or any part thereof” during the rebellion. The statute also imposed accountability that Lincoln’s unilateral suspension had lacked. The Secretary of State and the Secretary of War were required to furnish federal courts with lists of citizens held as political prisoners. If a federal grand jury adjourned without indicting a listed prisoner, the court was required to order that prisoner brought forward and discharged on a recognizance bond.8GovInfo. 12 Stat. 755 – An Act Relating to Habeas Corpus, and Regulating Judicial Proceedings in Certain Cases The government could no longer warehouse detainees indefinitely. If prosecutors could not persuade a grand jury to indict, the prisoner walked.
What Happened to Merryman
Merryman did not remain at Fort McHenry for long. His case was transferred to the civilian court system, and friends posted a $40,000 bond to secure his release. He was indicted for treason, but the government never brought him to trial. The charges were formally dropped on April 23, 1867, after the Attorney General approved a recommendation for dismissal.9Maryland State Archives. John Merryman Merryman went on to serve as Maryland’s State Treasurer and later in the state House of Delegates.
Why the Case Still Matters
Taney’s opinion was never overturned, but it was never enforced either. Because it came from a single justice at chambers rather than from the full Court, it carries moral authority without binding legal force. Whether the president can unilaterally suspend habeas corpus has never been definitively resolved by the Supreme Court.
The closest the Court came was five years later in Ex parte Milligan (1866), which involved an Indiana civilian tried and sentenced to death by a military tribunal. The Court held unanimously that military commissions cannot try civilians when civilian courts are open and functioning. “Martial rule can never exist where the courts are open, and in the proper and unobstructed exercise of their jurisdiction,” the Court wrote, adding that even Congress could not grant such power.10Library of Congress. Ex parte Milligan, 71 U.S. 2 Milligan vindicated much of Taney’s core argument: civilian courts must remain the primary check on executive power, even during rebellion.
The tensions surfaced again after September 11, 2001, when the federal government detained individuals as enemy combatants without criminal charges. In Hamdi v. Rumsfeld (2004), the Supreme Court held that a U.S. citizen detained as an enemy combatant must receive “a meaningful opportunity to contest the factual basis for that detention before a neutral decisionmaker.” The Court acknowledged the government’s national security interests but insisted that habeas corpus and due process do not vanish because the executive invokes military necessity.11Justia Law. Hamdi v. Rumsfeld, 542 U.S. 507 The principle echoed what Taney had written 143 years earlier. Every time the government claims emergency power to detain without judicial oversight, the debate returns to the questions Taney and Lincoln fought over in the spring of 1861.