Amongst other measures taken by Hood may be mentioned the garrisoning of Diamond Rock, which he commissioned as a sloop-of-war to blockade the approaches of Martinique (see James, Naval History, iii.
Upon the outbreak of the American Civil War in 1861, Lord Palmerston acknowledged that it was the duty of the British government to stand aloof from the fray; but his own opinion led him rather to desire than to avert the rupture of the Union, which might have been the result of a refusal on the part of England and France to recognize a blockade of the Southern ports, which was notoriously imperfect, and extremely prejudicial to the interests of Europe.
This factor was the rupture of communications with foreign countries, due in the earlier stages of the war to the limitation, and at one time the prohibition, of exports by neutral countries, the passing over of some of these countries to the enemy, and lastly the blockade by the enemy Powers, which increased in efficiency and made it more and more difficult to import the most essential commodities, until in the end it was almost impossible to obtain from abroad anything, needed either for the soldiers or the civilians.
Alcibiades, after a severe blockade (408 B.C.), gained possession of the city through the treachery of the Athenian party; in 405 B.C. it was retaken by Lysander and placed under a Spartan harmost.
In 310 Agathocles, defeated and besieged in Syracuse, took the desperate resolve of breaking through the blockade and attacking the enemy in Africa.
After his return to the coast of Cuba he conducted the blockade of Santiago, and the ships under his command destroyed the Spanish vessels when they issued from the harbor of Santiago and attempted to escape (see Spanish-American War).
A blockade of Egypt by an international fleet, an alliance with the Mongols, the union of the two great orders - these are the three staple heads of these proposals.
The blockade of the harbour by Yeo was abandoned in June 1814 after the defeat of a force from the squadron sent out to capture guns which were being brought from Oswego to Sackett's.
The prospect of an English blockade of Malta encouraged the revolt, of which Canon Caruana became the leader.
During the long wars with Genoa, after the defeats of Curzola, Sapienza, Pola, above all during the crisis of the war of Chioggia, it had been brought home to the Venetians that, as they owned no meat or corn-producing territory, a crushing defeat at sea and a blockade on the mainland exposed them to the grave danger of being starved into surrender.