A reprisal is a limited and deliberate violation of international law to punish another sovereign state that has already broken them. Reprisals in the laws of war are extremely limited, as they commonly breach the rights of non-combatants, an action outlawed by the 1949 Geneva Convention.
Reprisals refer to acts which are illegal if taken alone, but become legal when adopted by one state in retaliation for the commission of an earlier illegal act by another state. Counter-reprisals are generally not allowed.
An example of reprisal is the Naulila dispute between Portugal and Germany in October 1914. After three Germans were mistakenly killed in Naulila on the border of the then-Portuguese colony of Angola (in a manner that did not violate international law), Germany carried out a military raid on Naulila, destroying property in retaliation. A claim for compensation was brought by Portugal. The tribunal emphasized that before reprisals could be legally undertaken, a number of conditions had to be satisfied:
- There had to be a previous act by the other party that violated international law.
- Reprisals had to be preceded by an unsatisfied demand for reparation or compliance with the violated international law.
- There must be proportionality between the offence and reprisal.
After 1945, as a result of the general prohibition on use of force imposed by Article 2(4) of the United Nations Charter, armed reprisals in time of peace are no longer legal, but the possibility remains of non-armed reprisals (also known as countermeasures) as well as belligerent reprisals during hostilities when the law of international armed conflict (LOIAC) is violated.
In the case of belligerent reprisals, apart from the three factors in the Naulila case, a warning must also be issued beforehand; once the other party has stopped violation of LOIAC, belligerent reprisals must also be terminated; and the decision to engage in belligerent reprisals must be taken by a competent authority. All four Geneva Conventions prohibit reprisals against, respectively, battlefield casualties, shipwreck survivors, prisoners of war, and protected persons (civilian or military), as well as certain buildings and property. An additional 1977 protocol extends this to cover historic monuments, works of art, and places of worship.
According to Kenneth Anderson, restrictions on reprisal continue to restrict the circumstances in which it can be lawfully employed, and "[t]he trend... is to outlaw reprisal under all circumstances".
- Karl Josef Partsch: Self-Preservation. EPIL IV (2000), pages 380-383
- "reprisal (n.) etymonline.com. Retrieved December 13, 2014.
- Shaw 2008, p. 1129.
- Brownlie 2008, p. 466.
- Dinstein 2004, p. 220.
- "Customary IHL - Rule 146. Reprisals against Protected Persons". ihl-databases.icrc.org. Retrieved 2016-10-10.
- "CHAPTER 8 - REMEDIES FOR VIOLATION OF INTERNATIONAL LAW; WAR CRIMES". ihl-databases.icrc.org. Retrieved 2016-10-10.
- Anderson 1999, p. 311.
- Anderson, Kenneth (1999). "Reprisal killings". In Gutman, Roy; Rieff, David; Anderson, Kenneth (eds.). Crimes of War: What the Public Should Know . New York: W. W. Norton & Company. ISBN 9780393319149.
- Brownlie, Ian (2008). Principles of Public International Law (7 ed.). New York: Oxford University Press. ISBN 978-0-19-921770-0.
- Dinstein, Yoram (2004). The Conduct of Hostilities under the Law of International Armed Conflict. Cambridge: Cambridge University Press. ISBN 0-521-54227-8.
- Shaw, Malcolm (2008). International Law (6th edn). Cambridge: Cambridge University Press. ISBN 978-0-521-72814-0.
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- Encyclopædia Britannica (11th ed.). 1911. .