In October 1864 Lambdin P. Milligan, a citizen of Indiana who had lived in the state for twenty years and had never been in the military or naval service of the United States, was arrested at his home by order of General Alvin P. Hovey, commanding the military district of Indiana.
He was charged with conspiracy against the United States, affording aid and comfort to rebels, inciting insurrection, disloyal practices, and violation of the laws of war.
On October 21, 1864, Milligan was brought before a military commission convened at Indianapolis pursuant to orders from the President and the War Department; the commission found him guilty on all charges and sentenced him to death, a sentence approved by the President with execution first set for May 19, 1865, and later postponed.
After the military proceedings ended, Milligan petitioned the Circuit Court of the United States for the District of Indiana for a writ of habeas corpus, asserting that the military commission lacked jurisdiction because he was a civilian citizen of a loyal state where the civil courts remained open and functioning.
The petition stated that a grand jury had convened in the Circuit Court in January 1865, had been charged to inquire into violations of United States law, and had adjourned without indicting or presenting him; no indictment or presentment was ever returned against him.
The petition was presented in open court on May 10, 1865, and the United States attorney appeared and submitted the application by agreement.
The Circuit Court judges divided on three questions and certified them to the Supreme Court: whether a writ of habeas corpus ought to issue on the facts stated in the petition and exhibits, whether Milligan ought to be discharged from custody, and whether the military commission had jurisdiction to try and sentence him.
The record filed with the certificate included the order convening the commission, the charges and specifications, the commission's findings and sentence, and the War Department order reciting presidential approval and directing execution.
The Supreme Court heard argument from counsel for Milligan and for the United States on the certified questions.
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