Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
  • Ballentine's Law Dictionary

    The closing of a port or coast by an enemy so as to prevent egress or ingress. See 2 Am. Dec. 209.

  • Black's Law Dictionary: 2nd Edition

    In international law. A marine investment or beleaguering of a town or harbor. A sert of circumvallation round a place by which all foreign connection and correspondence is, as far as human power can effect it, to be cut off. 1 C. Rob. Adm. 151. It is not necessary, however, that the place should be invested by land, as well as by sea, in order to constitute a legal blockade; and, if a place be blockaded by sea only, it is no violation of belligerent rights for the neutral to carry on commerce with it by inland communications. 1 Kent, Comm. 147. The actual investment of a port or place by a hostile force fully competent, under ordinary circumstances, to cut off all communication therewith, so arranged or disposed as to be able to apply its force to every point of practicable access or approach to the port or place so invested. Bouvier; The Olinde Rodrigues (D. C.) 91 Fed. 274; Id., 174 U. S. 510, 19 Sup. Ct. 851, 48 Lt Eld. 1065; U. S. v. The William Arthur, 28 Fed. Cas. 624; The Peterhoff, 5 Wall. 50, 18 I. Eld. 564 ; Grinnan v. Edwards, 21 W. Va. 347. It is called a "blockade de facto" when the usual notice of the blockade has not been given to the neutral powers by the government causing the Investment, in consequence of which the blockading squadron has to warn off all approaching vessels.
    —Paper blockade. The state of a line of coast proclaimed to be under blockade in time of war, when the naval force on watch is not sufficient to repel a real attempt to enter.
    —Public blockade. A blockade which is not only established in fact, but is notified, by the government directing it, to other governments ; as distinguished from a simple blockade, which may be established by a naval officer acting upon his own discretion or under direction of superiors, without governmental notification. The Circassian, 2 Wall. 150, 17 L. Ed. 796.
    —Simple blockade. One established by a naval commander acting on his own discretion and responsibility, or under the direction of a superior officer, but without governmental outers or notification. The Circassian, 2 Wall. 150, 17 L. Ed. 796.