Caroline test

The Caroline test is a 19th-century formulation of customary international law, reaffirmed by the Nuremberg Tribunal after World War II, which said that the necessity for preemptive self-defense must be "instant, overwhelming, and leaving no choice of means, and no moment for deliberation." The test takes its name from the Caroline affair.

Historical background

In 1837, settlers in Upper Canada rebelled against the British colonial government. The United States remained officially neutral about the rebellion, but American sympathizers assisted the rebels with men and supplies, transported by a steamboat named the Caroline. In response, a British force from Canada entered United States territory at night, seized the Caroline, set the ship on fire, and sent it over Niagara Falls. At least one American was killed.[1] The British claimed that the attack was an act of self-defense. In a letter to the British Ambassador, Secretary of State Daniel Webster argued that a self-defense claimant would have to show that the:

necessity of self-defense was instant, overwhelming, leaving no choice of means, and no moment of deliberation ..., and that the British force, even supposing the necessity of the moment authorized them to enter the territories of the United States at all, did nothing unreasonable or excessive; since the act, justified by the necessity of self-defense, must be limited by that necessity, and kept clearly within it.[2]

Requirements

The terms "anticipatory self-defense", "preemptive self-defense" and "preemption" traditionally refers to a state's right to strike first in self-defense when faced with imminent attack.[3] In order to justify such an action, the Caroline test has two distinct requirements:

  1. The use of force must be necessary because the threat is imminent and thus pursuing peaceful alternatives is not an option (necessity);
  2. The response must be proportionate to the threat (proportionality).[4]

In Webster's original formulation, the necessity criterion is described as "instant, overwhelming, leaving no choice of means, and no moment of deliberation". This has later come to be referred to as "instant and overwhelming necessity".[5][6]

Significance

The principle of self-defense had been acknowledged prior to the Caroline test, but it was notable for setting out specific criteria by which it could be determined whether there had been a legitimate exercise of that right.[7] The test was accepted by the United Kingdom and came to be accepted as part of customary international law.[7]

The threat or use of force is prohibited by customary international law and the UN Charter when it is part of a preventive war waged against the territory of any State. In the Lotus case, the Permanent Court of International Justice decided, "the first and foremost restriction imposed by international law upon a State is that – failing the existence of a permissive rule to the contrary – it may not exercise its power in any form in the territory of another State."[8] The Caroline test was recognized and endorsed by the Nuremberg Tribunal, who adopted the same words used in the test in judging Germany's invasion of Norway and Denmark during World War II.[9]

The right of self-defense is permitted, when the conditions of customary international law regarding necessity and proportionality are met. Article 51 of the UN Charter recognizes "the inherent right of individual or collective self-defense if an armed attack occurs against a Member of the United Nations, until the Security Council has taken measures necessary to maintain international peace and security." The Caroline test applies in cases where Article 51 is not a permissive rule because a defensive action was taken before an armed attack occurred.[6]

To this day, the Caroline test is considered the customary law standard in determining the legitimacy of self-defense action.[10] In 2008, Thomas Nichols wrote:

Thus the destruction of an insignificant ship in what one scholar has called a 'comic opera affair' in the early 19th century nonetheless led to the establishment of a principle of international life that would govern, at least in theory, the use of force for over 250 years.[1]

Possible examples

The Cuban Missile Crisis, Six-Day War, and the attack on an Iraqi nuclear reactor are considered the closest situations in which the Caroline test would have been applicable.[11]

gollark: If you run network services as root, any exploit in them will be much more dangerous to the whole system.
gollark: NOT ROOT
gollark: No. Firewall EVERYTHING. Let no traffic pass.
gollark: 1.8ish years.
gollark: And no, I do not.

See also

References
  1. Nichols, Thomas (2008). The Coming Age of Preventive War. University of Pennsylvania Press. p. 2. ISBN 978-0-8122-4066-5
  2. Webster, Daniel. 'Letter to Henry Stephen Fox', in K.E Shewmaker (ed.). The Papers of Daniel Webster: Diplomatic Papers, vol. 1. 1841-1843 (1983) 62. Dartmouth College Press. ISBN 978-0-87451-245-8
  3. Charles Pierson (2004). "Preemptive Self-Defense in an Age of Weapons of Mass Destruction: Operation Iraqi Freedom". Denver Journal of International Law and Policy. University of Denver. 33 (1).
  4. The Legal War: A Justification for Military Action in Iraq, Gonzaga Journal of International Law, archived from the original on 2010-01-16
  5. May, Larry (2007). War Crimes and Just War. Cambridge University Press. p. 206. ISBN 978-0-521-69153-6
  6. Kirgis, Frederic L. (June 2002). "Pre-emptive Action to Forestall Terrorism". American Society of International Law. Archived from the original on 7 July 2010. Retrieved 17 August 2010.
  7. O'Brien, John (2002). International law. Cavendish Publishing Limited. p. 682. ISBN 978-1-85941-630-3 Extract
  8. Case of the S.S. "Lotus" (France v. Turkey), PCIJ Series A, No. 10, at p. 18 (1927) Archived 2013-09-27 at the Wayback Machine
  9. Olaoluwa, Olusanya (2006). Identifying the Aggressor Under International Law: A Principles Approach. Peter Lang Pub Inc. p. 105. ISBN 978-3-03910-741-4
  10. Duffy, Helen (2005). The 'War on Terror' and the Framework of International Law. Cambridge University Press. p. 157. ISBN 978-0-521-54735-2
  11. Arend, Anthony Clark (Spring 2003). "International Law and the Preemptive Use of Military Force" (PDF). The Washington Quarterly. 26 (2): 89–103. doi:10.1162/01636600360569711.
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