by 
The Curious Bag
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A blockade is a military maneuver, akin to a form of siege. The aim is to cut off an enemy nation, city or holding from any form of supply, eventually forcing the enemy to capitulate.
Hostility
A blockade is invariably a hostile maneuver, undertaken as an act of war. In this sense, it differs from sanctions or embargoes, which are undertaken in peacetime.
Methodology
A blockade is enacted by encircling the blockaded territory with military forces, stopping anyone attempting to enter or leave and searching them for food, weapons and other important goods.
Modern Permutations
In modern warfare, a blockade can include jamming electronic signals such as radio or TV, in order to keep the blockaded territory from sending or receiving information.
Naval Maneuvers
A blockade is traditionally a naval maneuver, undertaken with ships. Land blockades do take place as well, however.
Difficulties
Maintaining a blockade can be difficult, since it requires numerous military forces in order to keep people from slipping through. A blockade must also be constantly enforced, subjecting the blockading forces to harsh weather or other conditions while the blockade is in effect.
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