The Blockade reference article from the English Wikipedia on 24-Jul-2004
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Blockade

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A blockade is an effort usually (but not always, see below) at sea, to prevent supplies from reaching the enemy.

A blockade is also the attritional aspect of a siege, with the besiegers preventing food supplies from reaching the besieged. If the siege lasted long enough, defenders and civilians might have been reduced to eating anything vaguely edible to avoid starvation—family pets, the leather from shoes, and even each other. In modern times, the related "low-impact" attritional weapon of economic sanctions has been applied to blockade whole countries (for instance, Cuba, Libya and Iraq).

Historical blockades include:

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