What is a "Corsair"?

The Legal Definition of a Corsair:

"Corsair", in international law, is the term applied to a privately owned armed vessel whose owners are commissioned by a nation to carry on naval warfare on their behalf. Such naval commissions or authorizations are called "Letters of Marque".  Privateering is distinguished from piracy, which is carried out without enlistment by a government.

Corsairs, like Piravteers, were abolished by the Declaration of Paris of 1856, but the declaration was not supported by the United States, Spain, Mexico, and Venezuela. The Hague Conference of 1907 prescribed the conditions under which a private merchant vessel converted to war purposes has the status of a warship. Under the U.S. Constitution, Congress has the power to issue "Letters of Marque" and therefore to make use of Corsairs and Privateers. This practice of licensing independent naval vessels for this purpose preceded the creation of national navies.

During the Middle Ages, European states having few or no warships hired merchant vessels for hostile purposes. The issuing of "Letters of Marque" to ship owners or procurers, authorizing them to prey on the commerce of the enemy, eventually came into general use. By way of compensation, these licensed ships were allowed to share any booty captured.

Corsairs and Privateers carried on their practices during the American Revolution and the War of 1812. Congress authorized the president to commission Privateering in 1863 during the American Civil War, but the power was not exercised; the Confederacy, however, engaged in highly active Privateering during this period. Privateering was expressly renounced by the United States during the Spanish-American War of 1898.

At the Hague Conference of 1922-23, called to formulate the regulation of the use of aircraft and radio in time of war, the countries then present issued a joint declaration against the use of privateers in aerial warfare. The report stated that because belligerent rights at sea could be exercised only by units under the direct authority, immediate control, and responsibility of the warring nation, belligerent rights in the air should also be exercised only by military aircraft.

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