A declaration of war is a formal act by which one nation goes to war against another. The declaration is a performative speech act (or the signing of a document) by an authorized party of a national government, in order to create a state of war between two or more states.
The legality of who is competent to declare war varies between nations and forms of government. In many nations, that power is given to the head of state or sovereign. In other cases, something short of a full declaration of war, such as a letter of marque or a covert operation, may authorise war-like acts by privateers or mercenaries. The official international protocol for declaring war was defined in the Hague Convention (III) of 1907 on the Opening of Hostilities.
Since 1945, developments in international law such as the United Nations Charter, which prohibits both the threat and the use of force in international conflicts, have made declarations of war largely obsolete in international relations. In addition to this, non-state or terrorist organizations may claim to or be described as "declaring war" when engaging in violent acts. These declarations may have no legal standing in themselves, but they may still act as a call to arms for supporters of these organizations.
- Categorical theory, under which the power to declare war includes "the power to control all decisions to enter war". This means that the power to 'declare war' in effect rests with the ability to engage in combat.
- Pragmatic theory, which states that the power to declare war can be made unnecessary by an act of war in itself.
- Formalist theory, under which the power to declare war constitutes only a formal documentation of executive war-making decisions. This sits closest to traditional legal conceptions of what it is to declare a war.
Types of declarationsEdit
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An alternative typology based upon the form of the declaration is formulated by Brien Hallett  according to 1) the degree to which the state and condition of war exists, 2) the degree of justification, 3) the degree of ceremony of the speech act, and 4) the degree of perfection of the speech act:
- Degree of existence of the war
- A conditional declaration of war declares war conditionally, threatening war if the grievances listed are not acknowledged and the preferred remedies demanded are not accepted.
- An absolute declaration of war declares war absolutely due to the failure of negotiations over the grievances and remedies found in the conditional declaration. It ends absolutely the state and condition of peace, replacing it with the state and condition of war until such time as peace is restored.
- Degree of justification of the war
- A reasoned declaration of war justifies the resort to war by stating the grievances that have made peace intolerable and the remedies that will restore peace.
- An unreasoned declaration of war does not justify the resort to war, or does so only minimally.
- Degree of ceremony with which the speech act was made
- A formal or solemn declaration of war is a declaration made by the constitutionally recognized nation following the appropriate laws, rites and rituals.
- An informal or unsolemn declaration of war is a declaration made in an irregular manner either by a constitutionally unrecognized nation or by the constitutionally recognized nation using unlawful, inappropriate procedures.
- Degree of perfection with which the speech act was made
- A perfect declaration of war is a formal, solemn speech act made in accordance with the proper laws, rites, and rituals.
- An imperfect declaration of war is an informal, unsolemn speech act not made in accordance with the proper laws, rites and rituals.
However, the practice of declaring war was not always strictly followed. In his study Hostilities without Declaration of War (1883), the British scholar John Frederick Maurice showed that between 1700 and 1870 war was declared in only 10 cases, while in another 107 cases war was waged without such declaration (these figures include only wars waged in Europe and between European states and the United States, not including colonial wars in Africa and Asia).
In modern public international law, a declaration of war entails the recognition between countries of a state of hostilities between these countries, and such declaration has acted to regulate the conduct between the military engagements between the forces of the respective countries. The primary multilateral treaties governing such declarations are the Hague Conventions.
The League of Nations, formed in 1919 in the wake of the First World War, and the General Treaty for the Renunciation of War of 1928 signed in Paris, France, demonstrated that world powers were seriously seeking a means to prevent the carnage of another world war. Nevertheless, these powers were unable to stop the outbreak of the Second World War, so the United Nations (UN) was established following that war in a renewed attempt to prevent international aggression through declarations of war.
Denigration of formal declarations of war before WWIIEdit
In classical times, Thucydides condemned the Thebans, allies of Sparta, for launching a surprise attack without a declaration of war against Plataea, Athens' ally – an event that touched off the Peloponnesian War.
The utility of formal declarations of war has always been questioned, either as sentimental remnants of a long-gone age of chivalry or as imprudent warnings to the enemy. For example, writing in 1737, Cornelius van Bynkershoek judged that "nations and princes endowed with some pride are not generally willing to wage war without a previous declaration, for they wish by an open attack to render victory more honourable and glorious." Writing in 1880, William Edward Hall judged that "any sort of previous declaration therefore is an empty formality unless the enemy must be given time and opportunity to put himself in a state of defence, and it is needless to say that no one asserts such a quixotism to be obligatory."
Agreed Procedure for the Opening of Hostilities according to the Hague Convention (III) of 1907Edit
The Hague Convention (III) of 1907 called "Convention Relative to the Opening of Hostilities" gives the international actions a country should perform when opening hostilities. The first two Articles say:
- The Contracting Powers recognize that hostilities between themselves must not commence without previous and explicit warning, in the form either of a reasoned declaration of war or of an ultimatum with conditional declaration of war.
- The existence of a state of war must be notified to the neutral Powers without delay, and shall not take effect in regard to them until after the receipt of a notification, which may, however, be given by telegraph. Neutral Powers, nevertheless, cannot rely on the absence of notification if it is clearly established that they were in fact aware of the existence of a state of war.
Formal Declarations of War during World War IIEdit
3 September 1939 – United Kingdom, India, France, Australia and New Zealand declared war on Germany.
6 September 1939 – South Africa declared war on Germany.
10 September 1939 – Canada declared war on Germany.
24 April 1940 – Germany declared war on Norway
10 May 1940 – Netherlands declared war on Germany.
10 June 1940 – Italy declared war on UK and France.
23 November 1940 – Belgian government in exile declared war on Italy.
22 June 1941 – Germany declared war on the Soviet Union.
25 June 1941 – Finland declared war on the Soviet Union.
27 June 1941 – Hungary declared war on the Soviet Union.
7 December 1941 – Empire of Japan declared war on the United States, United Kingdom, Australia, New Zealand, and South Africa.
7 December 1941 – United Kingdom, Australia and New Zealand declared war on Finland, Romania and Hungary.
7 December 1941 – Canada declared war on Japan, Finland, Romania, and Hungary.
7 December 1941 – Panama declared war on Japan.
8 December 1941 – The United States, United Kingdom, Australia, Costa Rica, The Dominican Republic, El Salvador, Haiti, Honduras, The Netherlands, New Zealand and Nicaragua declare war on Japan.
9 December 1941 – Commonwealth of the Philippines declared war on Japan, Italy and Germany.
9 December 1941 – Republic of China declared war on Japan, Italy and Germany.
9 December 1941 – Cuba and Guatemala declared war on Japan.
11 December 1941 – Germany and Italy declared war on the United States.
11 December 1941 – The United States declared war on Germany and Italy.
11 December 1941 – Polish government in exile declared war on Japan.
12 December 1941 – Bulgaria, Hungary, Romania and Slovakia declared war on the United States and United Kingdom.
13 December 1941 – United Kingdom, New Zealand and the Union of South Africa declared war on Bulgaria.
14 December 1941 – Croatia declared war on the United States and United Kingdom.
16 December 1941 – Czechoslovak government in exile declared war on all countries at war with the United States, United Kingdom and the Soviet Union.
17 December 1941 – Albania (under Italian occupation) declared war on the United States.
19 December 1941 – Nicaragua declared war on Bulgaria, Hungary and Romania.
20 December 1941 – Belgium declared war on Japan.
6 January 1942 – Australia declared war on Bulgaria.
25 January 1942 – United Kingdom, New Zealand and the Union of South Africa declared war on Thailand.
22 May 1942 – Mexico declared war on Germany, Italy and Japan.
22 August 1942 – Brazil declared war on Germany and Italy.
2 April 1943 – Bolivia declared war on Germany, Italy and Japan.
9 September 1943 – Iran declared war on Germany.
13 October 1943 – Italy (after switching sides) declared war on Germany.
24 October 1943 – Provisional Government of Free India declared war on United Kingdom, and the United States.
26 November 1943 – Colombia in state of belligerency with Germany.
27 March 1944 – Argentina declared war on Germany and Japan.
25 August 1944 – Romania (after switching sides) declared war on Germany.
5 September 1944 – The Soviet Union declared war on Bulgaria.
8 September 1944 – Bulgaria declares war on Germany.
21 September 1944 – San Marino declared war on Germany.
22 September 1944 - The government of the Second Philippine Republic declared war on the United States and United Kingdom. The declaration took effect the following day.
7 February 1945 – Paraguay declared war on Germany and Japan.
12 February 1945 – Peru in state of belligerency with Germany and Japan.
15 February 1945 – Venezuela and Uruguay declared war on Germany and Japan.
23 February 1945 – Turkey declared war on Germany and Japan.
24 February 1945 – Egypt declared war on Germany and Japan.
26 February 1945 – Syria declared war on Germany and Japan.
1 March 1945 – Saudi Arabia declared war on Japan.
3 March 1945 – Finland (after switching sides) declared war on Germany.
11 April 1945 – Chile declared war on Japan.
6 July 1945 – Norway declared war on Japan
After World War IIEdit
In 1989, Panama declared itself to be in a state of war with the United States. On 13 May 1998, at the outbreak of the Ethiopian–Eritrean War, Ethiopia, in what Eritrean radio described as a "total war" policy, mobilized its forces for a full assault against Eritrea. The Claims Commission found that this was in essence an affirmation of the existence of a state of war between belligerents, not a declaration of war, and that Ethiopia also notified the United Nations Security Council, as required under Article 51 of the UN Charter.
Declared wars since 1945Edit
Declarations of war, while uncommon in the traditional sense, have mainly been limited to the conflict areas of the Western Asia and East Africa since 1945. Additionally, some small states have unilaterally declared war on major world powers such as the United States, United Kingdom, or Russia when faced with a hostile invasion and/or occupation.
This is a list of declarations of war (or the existence of war) by one sovereign state against another since the end of World War II in 1945. Only declarations that occurred in the context of a direct military conflict are included.
|Arab–Israeli War (1948–49)
Suez Crisis (1956)
Six-Day War (1967)
War of Attrition (1967-70)
Yom Kippur War (1973)
|15 May 1948||declaration of war|| Egypt
|Israel||Egypt: 26 March 1979
Jordan: 26 October 1994
Syria: still at war
Iraq: still at war
Lebanon: did not participate
|Ogaden War||13 July 1977||declaration of war||Somalia||Ethiopia||15 March 1978|
|Iran–Iraq War||22 September 1980||declaration of war||Iraq||Iran||20 July 1988|||
|Falklands War||11 May 1982||declaration of a war zone||Argentina||United Kingdom||20 June 1982|||
|United States invasion of Panama||15 December 1989||existence of a state of war||Panama||United States||31 January 1990|||
|Eritrean–Ethiopian War||14 May 1998||existence of a state of war||Ethiopia||Eritrea||25 May 2000|||
|Chadian Civil War (2005–10)||23 December 2005||declaration of war||Chad||Sudan||15 January 2010|||
|Djiboutian–Eritrean border conflict||13 June 2008||existence of a state of war||Djibouti||Eritrea||6 June 2010|||
|2008 South Ossetia war||9 August 2008||existence of a state of war||Georgia||Russia||16 August 2008|||
|Heglig Crisis||11 April 2012||existence of a state of war||Sudan||South Sudan||26 May 2012|||
Legality of any declaration of War since 1945Edit
The United Nations Charter is the foundation of modern international law. The UN Charter is a treaty ratified by members of the UN, which are therefore legally bound by its terms. Article 2(4) of the UN Charter generally bans the use of force by states except when carefully circumscribed conditions are met, stating:
All members shall refrain in their international relations from the threat or use of force against the territorial integrity or political independence of any state, or in any other manner inconsistent with the purposes of the United Nations.
This rule was "enshrined in the United Nations Charter in 1945 for a good reason: to prevent states from using force as they felt so inclined", said Louise Doswald-Beck, Secretary-General International Commission of Jurists.
Therefore, in the absence of an armed attack against a country or its allies, any legal use of force, or any legal threat of the use of force, has to be supported by a United Nations Security Council resolution authorizing member states to use force.
United Nations and warEdit
In an effort to force nations to resolve issues without warfare, framers of the United Nations Charter attempted to commit member nations to using warfare only under limited circumstances, particularly for defensive purposes.
The UN became a combatant itself after North Korea invaded South Korea on 25 June 1950 (see Korean War). The UN Security Council condemned the North Korean action by a 9-0 resolution (with the Soviet Union absent) and called upon its member nations to come to the aid of South Korea. The United States and 15 other nations formed a "UN force" to pursue this action. In a press conference on 29 June 1950, U.S. President Harry S. Truman characterized these hostilities as not being a "war" but a "police action".
The United Nations has issued Security Council Resolutions that declared some wars to be legal actions under international law, most notably Resolution 678, authorizing the 1991 Gulf War which was triggered by Iraq's invasion of Kuwait. UN Resolutions authorise the use of "force" or "all necessary means".
Throughout the Commonwealth realms (the UK, Canada, et al.) the formal right to declare war rests with the monarch, currently Elizabeth II, as part of the royal prerogative (for example in the UK) or that realm's written constitution.
According to Article 36 of the French constitution, the French Parliament has the right to declare war. 
Article 115a says that unless attacked by an opposing military force, Germany must vote a two-thirds majority vote in the Bundestag if under the threat of war.
Article 28.3.1° of the Constitution of Ireland states that "[w]ar shall not be declared and the State shall not participate in any war save with the assent of Dáil Éireann." Ireland has taken a policy of non-alignment (what many confuse with neutrality see: Irish Neutrality) in military terms and is thus not a member of NATO and has never participated in a war.
According to Italian Constitution, Parliament has the power to declare war.
According to Article 9 of the Japanese Constitution war is illegal. However, the Emperor of Japan is allowed to declare peace.
According to the Spanish constitution of 1978, Art. 64, the King, previously authorized by the Parliament, has the power to declare war and make peace.
According to 2010:1408 15 kap. $14 entitled "Krigsförklaring" (declaration of war) the Swedish cabinet (regeringen) may not declare Sweden to be at war without the parliaments (riksdagen) consent unless Sweden is first attacked.
In the United States, Congress, which makes the rules for the military, has the power under the constitution to "declare war". However neither the U.S. Constitution nor the law stipulate what format a declaration of war must take. War declarations have the force of law and are intended to be executed by the President as "commander in chief" of the armed forces. The last time Congress passed joint resolutions saying that a "state of war" existed was on 5 June 1942, when the U.S. declared war on Bulgaria, Hungary, and Rumania. Since then, the U.S. has used the term "authorization to use military force", as in the case against Iraq in 2003.
Sometimes decisions for military engagements were made by US presidents, without formal approval by Congress, based on UN Security Council resolutions that do not expressly declare the UN or its members to be at war. Part of the justification for the United States invasion of Panama was to capture Manuel Noriega (as a prisoner of war) because he was declared a criminal rather than a belligerent.
In response to the attacks on 11 September 2001, the United States Congress passed the joint resolution Authorization for Use of Military Force Against Terrorists on 14 September 2001, which authorized the US President to fight the War on Terror.
- Ongoing wars (mostly undeclared)
- Letter of protest
- Declarations of War during World War II
- Declaration of war by Canada
- Declaration of war by the United Kingdom
- Declaration of war by the United States
- United States declaration of war upon the United Kingdom (1812)
- German declaration of war against the Netherlands (1940)
- United Kingdom declaration of war on Japan (1941)
- State of emergency
- Jihad a declaration of war in Islam
- Undeclared war
- "Waging war: Parliament's role and responsibility" (PDF). House of Lords. 27 July 2006. Retrieved 21 April 2008.
Developments in international law since 1945, notably the United Nations (UN) Charter, including its prohibition on the threat or use of force in international relations, may well have made the declaration of war redundant as a formal international legal instrument (unlawful recourse to force does not sit happily with an idea of legal equality).
- "Basque raid 'declaration of war'". BBC News. 6 October 2007. Retrieved 21 April 2008.
- Iraq: Sadr speaks on "open war" as al-Qaeda to launch new campaign Al-Bawaba News; 20-04-08; Accessed 21-04-08
- Unleashing the Dogs of War: What the Constitution Means by 'Declare War' Prakash, Saikrishna; 2007; Cornell Law Review, Vol. 93, October 2007; Subscription Required
- Scholarship on the "Declare War" Power 22-01-08; Accessed 21-04-08
- Brien Hallett, Declaring War, Cambridge University Press, 2012, ISBN 978-1-107-60857-3, pp 104-8
- Brien Hallett, The Lost Art of Declaring War, University of Illinois Press, 1998, ISBN 0-252-06726-6, pp. 65f.
- Deut. 20:10–12, Judg. 11:1–32.
- Brien Hallett, The Lost Art of Declaring War, University of Illinois Press, 1998, ISBN 0-252-06726-6, pp. 66f.
- Thucydides. History of the Peloponnesian War, Book II.
- Bynkershoek, Cornelius van. 1930. Quæstionum Juris Publici Liber Duo (1737). Trans. Tenney Frank. The Classics of International Law No. 14 (2). Publications of the Carnegie Endowment for International Peace. Oxford at the Clarendon Press. (I, ii, 8)
- Hall, William Edward. 1924. A Treatise on International Law. 8th ed. by A. Pearce Higgins. London: Humphrey Milford: Oxford University Press. (p. 444)
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- World: Africa Eritrea: 'Ethiopia pursues total war'. BBC News. 6 June 1998.
- Jus Ad Bellum Ethiopia's Claims 1–8(pdf) Eritrea Ethiopia Claims Commission Page 6. Paragraph 17 (A commentary on Eritrea Ethiopia Claims Commission findings)
- Hancock, Stephanie (23 December 2005). "Chad in 'state of war' with Sudan". BBC News.
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- Theodore Draper (29 March 1990). "Did Noriega delcare war?". New York Review of Books.
- "Call to ease Chad-Sudan tension". BBC News. 25 December 2005.
- Peter Walker (9 August 2008). "Georgia declares 'state of war' over South Ossetia". The Guardian.
- Scott Baldauf (19 April 2012). "Sudan declares war on South Sudan". Christian Science Monitor.
- Howard Friel and Richard Falk, “The Record of the Paper: How the New York Times Misreports Foreign Policy,” Chapter I, Without Law of Facts, The United States Invades Iraq,” pages 15-17
- Article 2(4) of the UN Charter, http://www.yale.edu/lawweb/avalon/un/unchart.htm#art2
- International Commission of Jurists, 18 March 2003, Iraq - ICJ Deplores Moves Toward a War of Aggression on Iraq
- "The President's News Conference". 1950-06-29. Retrieved 2007-07-03.
- https://fas.org/man/crs/RS21323.pdf The United Nations Security Council – Its Role in the Iraq Crisis: A Brief Overview
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- Text of Resolution, http://www.gpo.gov/fdsys/pkg/PLAW-107publ40/pdf/PLAW-107publ40.pdf