Ex parte Milligan, 71 U.S. (4 Wall.) 2 (1866)
Ex parte Milligan is a landmark decision in American jurisprudence that fundamentally examines the balance of civil liberties during times of war and the scope of military authority. Decided in the aftermath of the American Civil War, this case addressed critical questions about the extent to which civilian rights can be curtailed under military authority and the interplay between martial law and the constitutional rights afforded to civilians.
Whether a non-combatant civilian citizen in a loyal state, where the civil courts are open and functioning, can be tried by a military tribunal.
Military tribunals cannot try civilians when civilian courts are available and operational, as it would violate constitutional rights providing for judicial processes and the protections of the Bill of Rights.
The Supreme Court held that it was unconstitutional to try Milligan, a civilian, by a military tribunal when the civilian courts were available and in session. Military tribunals cannot supplant civilian judicial processes absent the unavailability of civilian courts.
Ex parte Milligan is significant for solidifying the principle that civilian judicial rights are paramount and cannot be superseded by military tribunals when civilian courts are functional. It sets a lasting precedent in constitutional law emphasizing that the Constitution remains in force even during war or national emergencies. This case is vital for law students as it illustrates the judiciary's role in preserving constitutional liberties and limits to executive power, especially regarding military authority.