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Apr 25 2010

World War One: Declarations of War

The Central Powers declarations of war during World War One were:

In Date Order

German Declarations of War

  • 1 August 1914  Germany declared war on  Russia
  • 3 August 1914  Germany declared war on  France
  • 4 August 1914  Germany declared war on  Belgium
  • 9 March 1916  Germany declared war on  Portugal
  • 28 August 1916  Germany declared war on  Romania

Austria-Hungary Declarations of War

  • 28 July 1914  Austria-Hungary declared war on  Serbia
  • 6 August 1914  Austria-Hungary declared war on  Russia
  • 22 August 1914  Austria-Hungary declared war on  Belgium
  • 15 March 1916  Austria-Hungary declared war on  Portugal

Bulgarian Declarations of War

  • 14 October 1915  Bulgaria declared war on  Serbia
  • 1 November 1916  Bulgaria declared war on  Romania
  • 10 April 1917  Bulgaria declared war on  United States

Ottoman Empire Declarations of War

  • 30 August 1916  Ottoman Empire declared war on  Romania
  • 20 April 1917  Ottoman Empire declared war on  United States

The Allied Forces declarations of war during World War One were:

  • 4 August 1914  United Kingdom declared war on  Germany
  • 5 August 1914  Montenegro declared war on  Austria-Hungary
  • 6 August 1914  Serbia declared war on  Germany
  • 9 August 1914  Montenegro declared war on  Germany
  • 11 August 1914  France declared war on  Austria-Hungary
  • 12 August 1914  United Kingdom declared war on  Austria-Hungary
  • 23 August 1914  Japan declared war on  Germany
  • 25 August 1914  Japan declared war on  Austria-Hungary
  • 1 November 1914  Russia declared war on  Ottoman Empire
  • 2 November 1914  Serbia declared war on  Ottoman Empire
  • 3 November 1914  Montenegro declared war on  Ottoman Empire
  • 5 November 1914  United Kingdom declared war on  Ottoman Empire
  • 5 November 1914  France declared war on  Ottoman Empire
  • 23 May 1915  Italy declared war on  Austria-Hungary
  • 3 June 1915  San Marino declared war on  Austria-Hungary
  • 21 August 1915  Italy declared war on  Ottoman Empire
  • 15 October 1915  United Kingdom declared war on  Bulgaria
  • 15 October 1915  Montenegro declared war on  Bulgaria
  • 16 October 1915  France declared war on  Bulgaria
  • 19 October 1915  Italy declared war on  Bulgaria
  • 19 October 1915  Russia declared war on  Bulgaria
  • 27 August 1916  Romania declared war on  Austria-Hungary
  • 27 August 1916  Italy declared war on  Germany
  • 6 April 1917  United States declared war on  Germany
  • 7 April 1917  Cuba declared war on  Germany
  • 13 April 1917  Bolivia declared war on  Germany
  • 2 July 1917  Greece declared war on  Germany
  • 2 July 1917  Greece declared war on  Austria-Hungary
  • 2 July 1917  Greece declared war on  Ottoman Empire
  • 2 July 1917  Greece declared war on  Bulgaria
  • 22 July 1917  Siam declared war on  Germany
  • 22 July 1917  Siam declared war on  Austria-Hungary
  • 4 August 1917  Liberia declared war on  Germany
  • 14 August 1917  China declared war on  Germany
  • 14 August 1917  China declared war on  Austria-Hungary
  • 6 October 1917  Peru declared war on  Germany
  • 7 October 1917  Uruguay declared war on  Germany
  • 26 October 1917  Brazil declared war on  Germany
  • 7 December 1917  United States declared war on  Austria-Hungary
  • 7 December 1917  Ecuador declared war on  Germany
  • 10 December 1917  Panama declared war on  Austria-Hungary
  • 16 December 1917  Cuba declared war on  Austria-Hungary
  • 23 April 1918  Guatemala declared war on  Germany
  • 8 May 1918  Nicaragua declared war on  Germany
  • 8 May 1918  Nicaragua declared war on  Austria-Hungary
  • 23 May 1918  Costa Rica declared war on  Germany
  • 12 July 1918  Haiti declared war on  Germany
  • 19 July 1918  Honduras declared war on  Germany
  • 10 November 1918  Romania declared war on  Germany

By Country Order:

Against Germany

  • 4 August 1914  United Kingdom declared war on  Germany
  • 6 August 1914  Serbia declared war on  Germany
  • 9 August 1914  Montenegro declared war on  Germany
  • 23 August 1914  Japan declared war on  Germany
  • 27 August 1916  Italy declared war on  Germany
  • 6 April 1917  United States declared war on  Germany
  • 7 April 1917  Cuba declared war on  Germany
  • 13 April 1917  Bolivia declared war on  Germany
  • 2 July 1917  Greece declared war on  Germany
  • 22 July 1917  Siam declared war on  Germany
  • 4 August 1917  Liberia declared war on  Germany
  • 14 August 1917  China declared war on  Germany
  • 6 October 1917  Peru declared war on  Germany
  • 7 October 1917  Uruguay declared war on  Germany
  • 26 October 1917  Brazil declared war on  Germany
  • 7 December 1917  Ecuador declared war on  Germany
  • 23 April 1918  Guatemala declared war on  Germany
  • 8 May 1918  Nicaragua declared war on  Germany
  • 23 May 1918  Costa Rica declared war on  Germany
  • 12 July 1918  Haiti declared war on  Germany
  • 19 July 1918  Honduras declared war on  Germany
  • 10 November 1918  Romania declared war on  Germany

Against Austria-Hungary

  • 5 August 1914  Montenegro declared war on  Austria-Hungary
  • 11 August 1914  France declared war on  Austria-Hungary
  • 12 August 1914  United Kingdom declared war on  Austria-Hungary
  • 25 August 1914  Japan declared war on  Austria-Hungary
  • 23 May 1915  Italy declared war on  Austria-Hungary
  • 3 June 1915  San Marino declared war on  Austria-Hungary
  • 27 August 1916  Romania declared war on  Austria-Hungary
  • 2 July 1917  Greece declared war on  Austria-Hungary
  • 22 July 1917  Siam declared war on  Austria-Hungary
  • 14 August 1917  China declared war on  Austria-Hungary
  • 7 December 1917  United States declared war on  Austria-Hungary
  • 10 December 1917  Panama declared war on  Austria-Hungary
  • 16 December 1917  Cuba declared war on  Austria-Hungary
  • 8 May 1918  Nicaragua declared war on  Austria-Hungary

Against Ottoman Empire

  • 1 November 1914  Russia declared war on  Ottoman Empire
  • 2 November 1914  Serbia declared war on  Ottoman Empire
  • 3 November 1914  Montenegro declared war on  Ottoman Empire
  • 5 November 1914  United Kingdom declared war on  Ottoman Empire
  • 5 November 1914  France declared war on  Ottoman Empire
  • 21 August 1915  Italy declared war on  Ottoman Empire
  • 2 July 1917  Greece declared war on  Ottoman Empire

Against Bulgaria

  • 15 October 1915  United Kingdom declared war on  Bulgaria
  • 15 October 1915  Montenegro declared war on  Bulgaria
  • 16 October 1915  France declared war on  Bulgaria
  • 19 October 1915  Italy declared war on  Bulgaria
  • 19 October 1915  Russia declared war on  Bulgaria
  • 2 July 1917  Greece declared war on  Bulgaria

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