Allies of World War I - Summary of Allied Declarations of War On Central Powers

Summary of Allied Declarations of War On Central Powers

The following table shows the timeline of the several declarations of war among the belligerent powers. Entries on a yellow background show severed diplomatic relations only, not actual declarations of war. Unless stated otherwise, declarations of war by and on the United Kingdom include de facto declarations by and on other members of the British Empire.

Date Declarer On
1914
July 28 Austria-Hungary Serbia
July 30 Russia Austria-Hungary
August 1 Germany Russia
August 3 Germany France
August 4 Germany Belgium
United Kingdom Germany
August 5 Montenegro Austria-Hungary
August 6 Austria-Hungary Russia
Serbia Germany
August 9 Montenegro Germany
August 11 France Austria-Hungary
August 12 United Kingdom Austria-Hungary
August 22 Austria-Hungary Belgium
August 23 Japan Germany
August 25 Japan Austria-Hungary
November 1 Russia Ottoman Empire
November 2 Serbia Ottoman Empire
November 3 Montenegro Ottoman Empire
November 5 United Kingdom
France
Ottoman Empire
1915
May 23 Italy Austria-Hungary
June 3 San Marino Austria-Hungary
August 21 Italy Ottoman Empire
October 14 Bulgaria Serbia
October 15 United Kingdom
Montenegro
Bulgaria
October 16 France Bulgaria
October 19 Italy
Russia
Bulgaria
1916
March 9 Germany Portugal
March 15 Austria-Hungary Portugal
August 27 Romania Austria-Hungary
Italy Germany
August 28 Germany Romania
August 30 Ottoman Empire Romania
September 1 Bulgaria Romania
1917
April 6 United States Germany
April 7 Cuba Germany
April 10 Bulgaria United States
April 13 Bolivia Germany
April 20 Ottoman Empire United States
July 2 Greece Germany
Austria-Hungary
Ottoman Empire
Bulgaria
July 22 Siam Germany
Austria-Hungary
August 4 Liberia Germany
August 14 China Germany
Austria-Hungary
October 6 Peru Germany
October 7 Uruguay Germany
October 26 Brazil Germany
December 7 United States Austria-Hungary
December 7 Ecuador Germany
December 10 Panama Austria-Hungary
December 16 Cuba Austria-Hungary
1918
April 23 Guatemala Germany
May 8 Nicaragua Germany
Austria-Hungary
May 23 Costa Rica Germany
July 12 Haiti Germany
July 19 Honduras Germany
November 10 Romania Germany

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