Ex parte Milligan, 71 U.S. (4 Wall.) 2 (1866), was a U.S. Supreme Court case that ruled the application of military tribunals to citizens when civilian courts are still operating is unconstitutional. In this particular case, the Court was unwilling to give President Abraham Lincoln's administration the power of military commission jurisdiction, part of the administration's controversial plan to deal with Union dissenters during the American Civil War. Justice David Davis, who delivered the majority opinion, stated that "martial rule can never exist when the courts are open" and confined martial law to areas of "military operations, where war really prevails", and when it was a necessity to provide a substitute for a civil authority that had been overthrown. Thank you for the reminder.