Blockade Of Cádiz (1797)
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A blockade is the act of actively preventing a country or region from receiving or sending out
food Food is any substance consumed by an organism for Nutrient, nutritional support. Food is usually of plant, animal, or Fungus, fungal origin and contains essential nutrients such as carbohydrates, fats, protein (nutrient), proteins, vitamins, ...
, supplies,
weapons A weapon, arm, or armament is any implement or device that is used to deter, threaten, inflict physical damage, harm, or kill. Weapons are used to increase the efficacy and efficiency of activities such as hunting, crime (e.g., murder), law ...
, or
communication Communication is commonly defined as the transmission of information. Its precise definition is disputed and there are disagreements about whether Intention, unintentional or failed transmissions are included and whether communication not onl ...
s, and sometimes people, by
military force A military, also known collectively as armed forces, is a heavily Weapon, armed, highly organized force primarily intended for warfare. Militaries are typically authorized and maintained by a sovereign state, with their members identifiable ...
. A blockade differs from an
embargo Economic sanctions or embargoes are commercial and financial penalties applied by states or institutions against states, groups, or individuals. Economic sanctions are a form of coercion that attempts to get an actor to change its behavior throu ...
or
sanction A sanction may be either a permission or a restriction, depending upon context, as the word is an auto-antonym. Examples of sanctions include: Government and law * Sanctions (law), penalties imposed by courts * Economic sanctions, typically a ba ...
, which are legal barriers to trade rather than physical barriers. It is also distinct from a
siege A siege () . is a military blockade of a city, or fortress, with the intent of conquering by attrition, or by well-prepared assault. Siege warfare (also called siegecrafts or poliorcetics) is a form of constant, low-intensity conflict charact ...
in that a blockade is usually directed at an entire country or region, rather than a fortress or city and the objective may not always be to conquer the area. A blockading power can seek to cut off all maritime transport from and to the blockaded country, although stopping all land transport to and from an area may also be considered a blockade. Blockades restrict the trading rights of neutrals, who must submit for inspection for contraband, which the blockading power may define narrowly or broadly, sometimes including food and medicine. In the 20th century,
air power Airpower or air power consists of the application of military aviation, military strategy and strategic theory to the realm of aerial warfare and close air support. Airpower began in the advent of powered flight early in the 20th century. A ...
has also been used to enhance the effectiveness of blockades by halting air traffic within the blockaded airspace. Close patrol of hostile ports, in order to prevent naval forces from putting to sea, is also referred to as a blockade. When coastal cities or fortresses were besieged from the landward side, the besiegers would often blockade the seaward side as well. Most recently, blockades have sometimes included cutting off electronic communications by jamming radio signals and severing undersea cables. Blockades often result in the starvation of the civilian population, notably during the blockade of Germany during
World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...
and the
blockade of Biafra The blockade of Biafra by the Nigerian federal government during the Nigerian Civil War (1967–1970) resulted in a famine that ultimately cost at least a million lives and ended with the capitulation of the secessionist state of Biafra. The Blo ...
during the
Nigerian Civil War The Nigerian Civil War (6 July 1967 – 15 January 1970), also known as the Biafran War, Nigeria-Biafra War, or Biafra War, was fought between Nigeria and the Republic of Biafra, a Secession, secessionist state which had declared its independen ...
. According to modern international law, blockades are an act of war. In that sense, a blockade can be legal only if applied in
self-defense Self-defense (self-defence primarily in Commonwealth English) is a countermeasure that involves defending the health and well-being of oneself from harm. The use of the right of self-defense as a legal justification for the use of Force (law), ...
– but never as part of a
war of aggression A war of aggression, sometimes also war of conquest, is a military conflict waged without the justification of self-defense, usually for territorial gain and subjugation, in contrast with the concept of a just war. Wars without international ...
. Blockades are illegal when used as to starve or to collectively punish a civilian population. In such case, they are a
war crime A war crime is a violation of the laws of war that gives rise to individual criminal responsibility for actions by combatants in action, such as intentionally killing civilians or intentionally killing prisoners of war, torture, taking hostage ...
and potentially a
crime against humanity Crimes against humanity are certain serious crimes committed as part of a large-scale attack against civilians. Unlike war crimes, crimes against humanity can be committed during both peace and war and against a state's own nationals as well as ...
.


History

Although primitive naval blockades have been in use for millennia, early attempts were limited by the time ships were able to stay at sea uninterruptedly. The first successful attempts at establishing a full naval blockade were made by the British
Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...
during the
Seven Years' War The Seven Years' War, 1756 to 1763, was a Great Power conflict fought primarily in Europe, with significant subsidiary campaigns in North America and South Asia. The protagonists were Kingdom of Great Britain, Great Britain and Kingdom of Prus ...
(1754–1763) against
France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...
. Following the 1759 British naval victory at Quiberon Bay, which ended any immediate threat of a major invasion of Britain, the British Royal Navy established a close blockade on the French coast. This starved French ports of commerce, weakening France's economy. Admiral Edward Hawke took command of the blockading fleet off Brest and extended the blockade to cover the entire French Atlantic coast from
Dunkirk Dunkirk ( ; ; ; Picard language, Picard: ''Dunkèke''; ; or ) is a major port city in the Departments of France, department of Nord (French department), Nord in northern France. It lies from the Belgium, Belgian border. It has the third-larg ...
to
Bordeaux Bordeaux ( ; ; Gascon language, Gascon ; ) is a city on the river Garonne in the Gironde Departments of France, department, southwestern France. A port city, it is the capital of the Nouvelle-Aquitaine region, as well as the Prefectures in F ...
, and also to
Marseille Marseille (; ; see #Name, below) is a city in southern France, the Prefectures in France, prefecture of the Departments of France, department of Bouches-du-Rhône and of the Provence-Alpes-Côte d'Azur Regions of France, region. Situated in the ...
on France's Mediterranean coast. During the North American operations of the Seven Years' War, the British Royal Navy also blockaded the French on the other side of the Atlantic, specifically impeding access and supply to the colonies of
New France New France (, ) was the territory colonized by Kingdom of France, France in North America, beginning with the exploration of the Gulf of Saint Lawrence by Jacques Cartier in 1534 and ending with the cession of New France to Kingdom of Great Br ...
on the St. Lawrence. Blockades thus contributed to the French loss of Canada in 1763. The strategic importance of blockade became increasingly apparent during the
French Revolutionary Wars The French Revolutionary Wars () were a series of sweeping military conflicts resulting from the French Revolution that lasted from 1792 until 1802. They pitted French First Republic, France against Kingdom of Great Britain, Great Britain, Habsb ...
of 1792 to 1802 and in
Napoleonic Wars {{Infobox military conflict , conflict = Napoleonic Wars , partof = the French Revolutionary and Napoleonic Wars , image = Napoleonic Wars (revision).jpg , caption = Left to right, top to bottom:Battl ...
of 1803 to 1815, when the Royal Navy successfully blockaded France, leading to major economic disruptions. The
Union blockade The Union blockade in the American Civil War was a naval strategy by the United States to prevent the Confederate States of America, Confederacy from trading. The blockade was proclaimed by President Abraham Lincoln in April 1861, and required ...
of southern ports was a major factor in the
American Civil War The American Civil War (April 12, 1861May 26, 1865; also known by Names of the American Civil War, other names) was a civil war in the United States between the Union (American Civil War), Union ("the North") and the Confederate States of A ...
of 1861 to 1865. During
World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...
(1914-1918), the Allies blockaded the Central Powers, depriving them of food-supplies and strategic materials. Germany's attempted U-boat blockade of Britain caused some shortages, but ultimately failed. A similar outcome followed in
World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
(1939-1945). Naval strategic thinkers, such as Sir Julian Corbett (1854-1922) and
Alfred Thayer Mahan Alfred Thayer Mahan (; September 27, 1840 – December 1, 1914) was a United States Navy officer and historian whom John Keegan called "the most important American strategist of the nineteenth century." His 1890 book '' The Influence of Sea Pow ...
(1840-1914), wrote that naval conflicts were won primarily by decisive battles, but also by blockade.


Types of blockade


Close, distant, and loose blockades

A ''close'' blockade entails placing warships within sight of the blockaded coast or port, to ensure the immediate interception of any ship entering or leaving. It is both the most effective and the most difficult form of blockade to implement. Difficulties arise because the blockading ships must remain continuously at sea, exposed to storms and hardship, usually far from any support, and vulnerable to sudden attack from the blockaded side, whose ships may stay safe in harbor until they choose to come out. In a ''distant'' blockade, the blockaders stay well away from the blockaded coast and try to intercept any ships going in or out. This may require more ships on station, but they can usually operate closer to their bases, and are at much less risk from enemy raids. This was almost impossible prior to the 16th century due to the nature of the ships used. A ''loose'' blockade is a close blockade where the blockading ships are withdrawn out of sight from the coast (behind the horizon) but no farther. The object of loose blockade is to lure the enemy into venturing out but to stay close enough to strike. British
admiral Admiral is one of the highest ranks in many navies. In the Commonwealth nations and the United States, a "full" admiral is equivalent to a "full" general in the army or the air force. Admiral is ranked above vice admiral and below admiral of ...
Horatio Nelson Horatio Nelson, 1st Viscount Nelson, 1st Duke of Bronte ( – 21 October 1805) was a Royal Navy officer whose leadership, grasp of strategy and unconventional tactics brought about a number of decisive British naval victories during the French ...
applied a loose blockade at
Cádiz Cádiz ( , , ) is a city in Spain and the capital of the Province of Cádiz in the Autonomous communities of Spain, autonomous community of Andalusia. It is located in the southwest of the Iberian Peninsula off the Atlantic Ocean separated fr ...
in 1805. The Franco-Spanish fleet under
Pierre-Charles Villeneuve Pierre-Charles-Jean-Baptiste-Silvestre de Villeneuve (; 31 December 1763 – 22 April 1806) was a French Navy officer who served during the French Revolutionary and Napoleonic Wars. He was in command of a French and Spanish fleet which was ...
then came out, resulting in the
Battle of Trafalgar The Battle of Trafalgar was a naval engagement that took place on 21 October 1805 between the Royal Navy and a combined fleet of the French Navy, French and Spanish Navy, Spanish navies during the War of the Third Coalition. As part of Na ...
.


Pacific blockade

Until 1827, blockades, as part of
economic warfare Economic warfare or economic war is an economic strategy used by belligerent states with the goal of weakening the economy of other states. This is primarily achieved by the use of economic blockades. Ravaging the crops of the enemy is a classic ...
, were always a part of a war. This changed when France,
Russia Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...
and Britain came to the aid of the Greek rebels against Turkey. They blockaded the Turkish-occupied coast, which led to the
battle of Navarino The Battle of Navarino was a naval battle fought on 20 October (O.S. 8 October) 1827, during the Greek War of Independence (1821–1829), in Navarino Bay (modern Pylos), on the west coast of the Peloponnese peninsula, in the Ionian Sea. Allied ...
. War was never declared, however, so it is considered the first ''pacific'' — i.e. peaceful — blockade. The first truly pacific blockade, involving no shooting at all, was the British blockade of the
Republic of New Granada The Republic of New Granada was a Centralism, centralist unitary republic consisting primarily of present-day Colombia and Panama with smaller portions of today's Costa Rica, Ecuador, Venezuela, Peru and Brazil that existed from 1831 to 1858. ...
in 1837, established to compel New Granada to release an imprisoned British consul.


Legal status

Since 1945, the
United Nations Security Council The United Nations Security Council (UNSC) is one of the six principal organs of the United Nations (UN) and is charged with ensuring international peace and security, recommending the admission of new UN members to the General Assembly, an ...
determines the legal status of blockades and by article 42 of the
UN Charter The Charter of the United Nations is the foundational treaty of the United Nations (UN). It establishes the purposes, governing structure, and overall framework of the United Nations System, UN system, including its United Nations System#Six ...
, the council can also apply blockades. The UN Charter allows for the right of self-defense but requires that this must be immediately reported to the Security Council to ensure the maintenance of international peace. According to the not ratified document San Remo Manual on International Law Applicable to Armed Conflicts at Sea, 12 June 1994, a blockade is a legal method of warfare at sea but is governed by rules. The manual describes what can never be contraband. The blockading nation is free to select anything else as contraband in a list, which it must publish. The blockading nation typically establishes a blockaded area of water, but any ship can be inspected as soon as it is established that it is attempting to break the blockade. This inspection can occur inside the blockaded area or in international waters, but never inside the territorial waters of a
neutral nation The Neutral Confederacy (also Neutral Nation, Neutral people, or ) was a tribal confederation of Iroquoian peoples. Its heartland was in the floodplain of the Grand River in what is now Ontario, Canada. At its height, its wider territory extend ...
. A neutral ship must obey a request to stop for inspection from the blockading nation. If the situation so demands, the blockading nation can request that the ship divert to a known place or harbour for inspection. If the ship does not stop, then the ship is subject to capture. If people aboard the ship resist capture, they can be lawfully attacked.


Act of war

According to modern international law, blockades are an act of war. In that sense, a blockade can be legal only if applied in the context
self-defense Self-defense (self-defence primarily in Commonwealth English) is a countermeasure that involves defending the health and well-being of oneself from harm. The use of the right of self-defense as a legal justification for the use of Force (law), ...
– but never as part of a
war of aggression A war of aggression, sometimes also war of conquest, is a military conflict waged without the justification of self-defense, usually for territorial gain and subjugation, in contrast with the concept of a just war. Wars without international ...
. Blockades are illegal when used as to starve or to collectively punish a civilian population. In such cases, they are a
war crime A war crime is a violation of the laws of war that gives rise to individual criminal responsibility for actions by combatants in action, such as intentionally killing civilians or intentionally killing prisoners of war, torture, taking hostage ...
and potentially a
crime against humanity Crimes against humanity are certain serious crimes committed as part of a large-scale attack against civilians. Unlike war crimes, crimes against humanity can be committed during both peace and war and against a state's own nationals as well as ...
.


Blockade planning

Blockades depend on four general factors * The value of the item being blockaded must warrant the need to blockade. For example, during the 1962
Cuban Missile Crisis The Cuban Missile Crisis, also known as the October Crisis () in Cuba, or the Caribbean Crisis (), was a 13-day confrontation between the governments of the United States and the Soviet Union, when American deployments of Nuclear weapons d ...
, the items to be blockaded (or "
quarantine A quarantine is a restriction on the movement of people, animals, and goods which is intended to prevent the spread of disease or pests. It is often used in connection to disease and illness, preventing the movement of those who may have bee ...
d" to use the more neutral term selected by President
John F. Kennedy John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), also known as JFK, was the 35th president of the United States, serving from 1961 until his assassination in 1963. He was the first Roman Catholic and youngest person elected p ...
) were
Medium-range ballistic missile A medium-range ballistic missile (MRBM) is a type of ballistic missile with medium range (aeronautics), range, this last classification depending on the standards of certain organizations. Within the United States Department of Defense, U.S. D ...
s, capable of delivering
nuclear weapon A nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission (fission or atomic bomb) or a combination of fission and fusion reactions (thermonuclear weapon), producing a nuclear exp ...
ry, bound for Cuba. Their value was high, as a military threat against the United States. * The strength of the blockading force must be equal to or greater in strength than the opposition. The blockade is only successful if the 'thing' in question is prevented from reaching its receiver. For example, the overwhelming power of the
Royal Navy The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom ...
allowed a successful blockade of Germany during and after World War I. * Geography. Knowing the routes of the enemy will help the blockader choose where to blockade: for example, a high
mountain pass A mountain pass is a navigable route through a mountain range or over a ridge. Since mountain ranges can present formidable barriers to travel, passes have played a key role in trade, war, and both Human migration, human and animal migration t ...
or a
strait A strait is a water body connecting two seas or water basins. The surface water is, for the most part, at the same elevation on both sides and flows through the strait in both directions, even though the topography generally constricts the ...
is a natural
choke point In military strategy, a choke point (or chokepoint), or sometimes bottleneck, is a geographical feature on land such as a valley, defile or bridge, or maritime passage through a critical waterway such as a strait, which an armed force is for ...
and a candidate for
fortification A fortification (also called a fort, fortress, fastness, or stronghold) is a military construction designed for the defense of territories in warfare, and is used to establish rule in a region during peacetime. The term is derived from Lati ...
. * A blockade tends to be a long campaign requiring a long-term commitment by the blockading power. The
Atlantic U-boat campaign of World War I The Atlantic U-boat campaign of World War I (sometimes called the "First Battle of the Atlantic", in reference to the World War II campaign Battle of the Atlantic, of that name) was the prolonged naval conflict between German submarines and the ...
and
Battle of the Atlantic The Battle of the Atlantic, the longest continuous military campaign in World War II, ran from 1939 to the defeat of Nazi Germany in 1945, covering a major part of the naval history of World War II. At its core was the Allies of World War II, ...
were essentially about German blockades, and lasted nearly as long as their respective wars. The
Imperial Japanese Navy The Imperial Japanese Navy (IJN; Kyūjitai: Shinjitai: ' 'Navy of the Greater Japanese Empire', or ''Nippon Kaigun'', 'Japanese Navy') was the navy of the Empire of Japan from 1868 to 1945, Potsdam Declaration, when it was dissolved followin ...
, however, made only sporadic efforts at blockade during the
Pacific War The Pacific War, sometimes called the Asia–Pacific War or the Pacific Theatre, was the Theater (warfare), theatre of World War II fought between the Empire of Japan and the Allies of World War II, Allies in East Asia, East and Southeast As ...
, preferring to seek victory by fleet action.


Blockade running

Blockade running is the practice of delivering cargo (food, for example) to a blockaded area. It has mainly been done by ships (called
blockade runner A blockade runner is a merchant vessel used for evading a naval blockade of a port or strait. It is usually light and fast, using stealth and speed rather than confronting the blockaders in order to break the blockade. Blockade runners usua ...
s) across ports under naval blockade. Blockade runners were typically the fastest ships available and often lightly armed and armored. It is now also been done by aircraft, forming airbridges, such as over the
Berlin Blockade The Berlin Blockade (24 June 1948 – 12 May 1949) was one of the first major international crises of the Cold War. During the multinational occupation of post–World War II Germany, the Soviet Union blocked the Western Allies' railway, roa ...
after
World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
.


See also

*
Blockade of the Gaza Strip The restrictions on movement and goods in Gaza imposed by Israel date to the early 1990s. After Hamas took over in 2007, Israel significantly intensified existing movement restrictions and imposed a complete blockade on the movement of good ...
*
Blockade of Nagorno-Karabakh The blockade of Nagorno-Karabakh was an event in the Nagorno-Karabakh conflict. The Nagorno-Karabakh, region was disputed between Azerbaijan and the List of states with limited recognition, breakaway Republic of Artsakh, Diplomatic recognition, i ...
*
Command of the sea Command of the sea (also called control of the sea or sea control) is a naval military concept regarding the strength of a particular navy to a specific naval area it controls. A navy has command of the sea when it is so strong that its rivals ...
* List of blockades * Maritime Exclusion Zone *
No-fly zone A no-fly zone, also known as a no-flight zone (NFZ), or air exclusion zone (AEZ), is a territory or area established by a military power over which certain aircraft are not permitted to fly. Such zones are usually set up in an enemy power's terri ...
*
Sea lines of communication Sea lines of communication (abbreviated as SLOC) is a term describing the primary maritime routes between ports, used for trade, logistics and naval forces. It is generally used in reference to naval operations to ensure that SLOCs are open, or ...
*
Navicert The navicert, short for navigation certificate, also known as a "Letter of Assurance", was a form of commercial passport issued to allow ships to pass through blockades without inspection. This was of particular relevance during the British naval b ...


References

* {{cite EB1911, wstitle=Blockade Law of the sea Military strategy Military operations by type Economic warfare tactics