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Serbia
Entered War - 28 July 1914
(Austro-Hungarian declaration of war) |
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Russia
Entered War - 1 August 1914
(declaration of war by Germany) |
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France
Entered War - 3 August 1914
(declaration of war by Germany) |
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Belgium
Entered War - 4 August 1914
(invaded by Germany) |
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United Kingdom
Entered War - 4 August 1914
(declared war on Germany following its invasion of Belgium)
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Australia
Entered War - 4 August 1914
(agreed to support Britain) |
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Canada
Entered War - 4 August 1914
(in support of Britain) |
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India
Entered War - 4 August 1914
(in support of Britain) |
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New Zealand
Entered War - 4 August 1914
(in support of Britain) |
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Rhodesia
Entered War - 4 August 1914
(in support of Britain) |
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Italy
Entered War - 23 May 1915
(declared war on Austria-Hungary) |
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Romania
Entered War - 27 August 1916
(declared war on Germany and Austria-Hungary) |
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Greece
Entered War - 27 June 1917
(declared war against the Central Powers) |
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Montenegro
Entered War - 7 August 1914
(declared war on Austria-Hungary) |
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Portugal
Entered War - 9 March 1916
(Germany declared war on Portugal) |
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Japan
Entered War - 23 August 1914
(declared war on Germany)
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