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

See also

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.
  3. ^ "Who Declared War and When". Firstworldwar.com.
  4. ^ Ian F.W. Becket, The Great War, second edition, Pearson Education Ltd., 2007, ISBN 978-1-4058-1252-8