Declarations of war during World War I

A declaration of war is a formal act by which one nation goes to war against another. A declaration is usually an act of delivering a performative speech (not to be confused with a mere speech) or the presentation of a signed document by an authorized party of a national government in order to create a state of war between two or more sovereign states. In the context of World War I, the official international protocol for declaring war was defined in the Hague Convention of 1907 (or Hague II).[1] For the diplomatic maneuvering behind these events, which led to hostilities between nations, see Diplomatic history of World War I.

## List of war declarations

Below is a table showing the outbreaks of wars between nations which occurred during World War I. Indicated are the dates (during the immediate build-up to, or during the course of, World War I) from which a de facto state of war existed between nations. The table shows both the initiator states and the state at which the declaration of war was aimed. Events listed include those in which there were a simple diplomatic breaking of relations that did not involve any physical attack, as well as those involving overt declarations or acts of aggression.

Date[2][3][4] | Initiator states | Targeted states

|
|

July 28, 1914  |  Austria-Hungary |  Serbia
August 1, 1914  |  Germany |  Russia
August 3, 1914  |  Belgium
France
August 4, 1914  |  British Empire |  Germany
August 5, 1914  |  Montenegro |  Austria-Hungary
August 6, 1914  |  Austria-Hungary |  Russia
Serbia |  Germany
August 8, 1914  |  Montenegro
August 12, 1914  |  British Empire |  Austria-Hungary
France
August 23, 1914  |  Japan |  Germany
August 25, 1914  |  Austria-Hungary
August 28, 1914  |  Austria-Hungary |  Belgium
November 1, 1914  |  Russia |  Ottoman Empire
November 5, 1914  |  France
British Empire
November 11, 1914  |  Ottoman Empire |  Russia
Japan
British Empire
December 2, 1914  |  Serbia |  Ottoman Empire
December 3, 1914  |  Montenegro
December 5, 1914  |  Japan
May 23, 1915  |  Italy |  Austria-Hungary
August 21, 1915  |  Ottoman Empire
August 28, 1916  |  Germany
October 14, 1915  |  Bulgaria |  Serbia
October 15, 1915  |  British Empire |  Bulgaria
Montenegro
October 16, 1915  |  Japan
France
October 19, 1915  |  Italy
Russia
March 9, 1916  |  Germany |  Portugal
March 15, 1916  |  Austria-Hungary
August 28, 1916  |  Romania |  Austria-Hungary
Germany |  Romania
August 30, 1916  |  Ottoman Empire
September 1, 1916  |  Bulgaria
April 6, 1917  |  United States |  Germany
April 7, 1917  |  Panama
Cuba
June 27, 1917  |  Greece |  Austria-Hungary
Germany
Bulgaria
Ottoman Empire
July 22, 1917  |  Siam |  Austria-Hungary
July 22, 1917  |  Germany
August 4, 1917  |  Liberia
August 14, 1917  |  China  |  Austria-Hungary
August 14, 1917  |  Germany
October 26, 1917  |  Brazil
December 7, 1917  |  United States |  Austria-Hungary
December 10, 1917  |  Panama
April 23, 1918  |  Guatemala |  Germany
May 6, 1918  |  Nicaragua |  Austria-Hungary
May 6, 1918  |  Germany
May 23, 1918  |  Costa Rica
July 12, 1918  |  Haiti
July 19, 1918  |  Honduras

## See also

* United Kingdom declaration of war upon Germany (1914)
* United States declaration of war on Germany (1917)
* United States declaration of war on Austria-Hungary

## References

1. ↑ On the Opening of Hostilities; 1907; Yale Law School Library; retrieved March 2014.
2. ↑ "World War: Declarations of War from Around the World". Library of Congress. https://www.loc.gov/law/help/digitized-books/world-war-i-declarations/foreign.php#U.
3. ↑ "Who Declared War and When". Firstworldwar.com. http://www.firstworldwar.com/features/declarationsofwar.htm.
4. ↑ Ian F.W. Becket, The Great War, second edition, Pearson Education Ltd., 2007, ISBN 978-1-4058-1252-8

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