of circumstances, and that the law applicable to one set of circumstances is not applicable to an essentially different set of circumstances. Expressed in another way, the Constitution itself provides for a state of war .as well as a state of peace, and martial law, the law of war, is the law applicable to a state of war. See Ex parte Milligan, 4 Wall., 121, 127, 137, 139, 140; Giffin v. Wilcox, 21 Ind. 378; Pomeroy, Man. Law, Secs. 694 et seq.; Prof. Parker in N. Am. Rev., Oct., 1861.
A.s to the person or body by whom martial law may be put in force: — In the British Empire, since the Petition of Bight, 1528, martial law has been instituted by Parliament, as in Ireland in 1803 and 1833; by the Irish Parliament, as in 1799; and by a Colonial Parliament, as in Jamaica in 1865; but the usual course has been for the military authorities to enforce such, law, without previous authority, and subject to ratification after-wards by Parliament or the Colonial legislative body by Act of Indemnity. Phillips v. Eyre, L. R. A Q. B. 243; Ib. L. R. 6 Q. B. 1; 1 Stephen, Hist. Or. L. 210. In the United States there is considerable difference of opinion as to the proper source from which a proclamation of martial law should emanate, but as matter of fact, this authority has been exercised by the President as Oommander-in-Chief, as in Kentucky in 1865; by his subordinates, as by Major-General Eremont in-St. Louis in 1861; by Congress, as by the Beconstruction Acts of 1867; by a State Legislature, as in Bhode Island in 1842; and by a Territorial Governor, as in Washington Territory in 1856, and again in 1885-6. Birkhimer, supra, passim.
As to when martial law may be enforced, it was said, obiter, in Ex parte Milligan, 4 Wall. 127, that “martial law cannot arise from a threatened invasion.” This remark was entirely uncalled for by the facts of the case, but was, nevertheless, followed, though unnecessarily, in Milligan v. Hovey, 3 Biss. 17. It is, however, opposed to the reasoning of the Court in Martin v. Mott, 12 Wh. 19, and has -been practically ignored in subsequent decisions of the same Court and is criticised as erroneous