Declarations of War.

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WWI Document Archive > Diaries, Memorials, Personal Reminiscences > Declarations of War.



The Nations Involved in the Great War

(from the Funk & Wagnalls New Encyclopaedia, 1983, Volume 27, p 418)


Austria-Hungary
Declared war on Serbia .........July 28, 1914
Declared war on Russia ........Aug 6, 1914
Declared war on Belgium ......Aug 28, 1914
Declared war on Portugal ......March 15, 1916

Belgium
Refused German ultimatum demanding permission for German troops to cross Belgium Aug 2, 1914
Invaded by Germany .........Aug 3-4, 1914

Bolivia
Severed relations with Germany ........April 13, 1917

Brazil
Severed relations with Germany .....April 11, 1917
Declared war on Germany .......Oct 26, 1917

Bulgaria
Declared war on Serbia .......Oct 14, 1915
Declared war on Romania ......Sept 1, 1916

China
Severed relations with German .....March 14, 1917
Declared war on Germany .....Aug 14, 1917
Declared war on Austria-Hungary ....Aug 14, 1917

Costa Rica
Severed relations with Germany ....Sept 21, 1917
Declared war on Germany ...May 23, 1918

Cuba
Declared war on Germany ....April 7, 1917

Ecuador
Severed relations with Germany ....Dec 8, 1917

France
Invaded by Germany ......Aug 2, 1914
Declared war on Austria-Hungary .....Aug 12, 1914
Declared war on Turkey ....Nov 5, 1914
Declared war on Bulgaria ....Oct 16, 1915

Germany
Declared war on Russia ....Aug 1, 1914
Declared war on France ....Aug 3, 1914
Declared war on Belgium ....Aug 4, 1914
Declared war on Portugal .....March 9, 1916

Great Britain
Declared war on Germany ....Aug 4, 1914
Declared war on Austria-Hungary ....Aug 12, 1914
Declared war on Turkey ....Nov 5, 1914
Declared war on Bulgaria ....Oct 15, 1915

Greece
Declared war on Austria-Hungary, Bulgaria, Germany and Turkey ....June 27, 1917

Guatemala
Declared war on Germany ....April 23, 1918

Haiti
Declared war on Germany ....July 12, 1918

Honduras
Declared war on Germany ....July 19, 1918


Italy
Declared war on Austria-Hungary .....May 23, 1915
Declared war on Turkey .....Aug 21, 1915
Declared war on Bulgaria .....Oct 19, 1915
Declared war on Germany ......Aug 28, 1916

Japan
Declared war on Germany .....Aug 23, 1914
Declared war on Austria-Hungary .....Aug 25, 1914

Liberia
Declared war on Germany .....Aug 4, 1914

Montenegro
Declared war on Austria-Hungary ....Aug 5, 1914
Declared war on Germany .....Aug 8, 1914
Declared war on Bulgaria .....Oct 15, 1915

Nicaragua
Declared war on Germany and Austria-Hungary .....May 8, 1918

Panama
Declared war on Germany ....April 7, 1917
Declared war on Austria-Hungary .....Dec 10, 1917

Peru
Severed relations with Germany .....Oct 6, 1917

Portugal
See Germany and Austria-Hungary in this table

Romania
Declared war on Austria-Hungary ....Aug 27, 1916
Capitulated to Central Powers by Treaty of Bucharest .....May 7, 1918
Re-entered the war on the side of the Allies ....Nov 10, 1918

Russia
Declared war on Turkey .....Nov 2, 1914
Declared war on Bulgaria ....Oct 19, 1915

San Marino
Declared war on Austria-Hungary ....June 3, 1915

Serbia
Declared war on Germany .....Aug 6, 1914
Declared war on Turkey .....Nov 2, 1914

Siam
Declared war on Germany and Austria-Hungary .....July 22, 1917

Turkey
Declared war on Romania ....Aug 30, 1916
Severed relations with the US .....April 23, 1917

US
Declared war on Germany ....April 6, 1917
Declared war on Austria-Hungary ....Dec 7, 1917

Uruguay
Severed relations with Germany .....Oct 7, 1917


WWI Document Archive > Diaries, Memorials, Personal Reminiscences > Declarations of War.