Date
|
Initiator Country
|
Targeted Country
|
Jul 28, 1914
|
Austria Hungary
|
Serbia
|
Aug 1, 1914
|
Germany
|
Russia
|
Aug 3, 1914
|
Germany
|
France
|
Aug 4, 1914
|
Germany
|
Belgium
|
Aug 4, 1914
|
United Kingdom
|
Germany
|
Aug 5, 1914
|
Montenegro
|
Austria Hungary
|
Aug 6, 1914
|
Austria Hungary
|
Russia
|
Aug 6, 1914
|
Serbia
|
Germany
|
Aug 8, 1914
|
Montenegro
|
Germany
|
Aug 12, 1914
|
United Kingdom
|
Austria Hungary
|
Aug 12, 1914
|
France
|
Austria Hungary
|
Aug 23, 1914
|
Japan
|
Germany
|
Aug 25, 1914
|
Japan
|
Austria Hungary
|
Aug 28, 1914
|
Austria Hungary
|
Belgium
|
Nov 2, 1914
|
Russia
|
Ottoman Empire
|
Nov 2, 1914
|
Serbia
|
Ottoman Empire
|
Nov 5, 1914
|
United Kingdom
|
Ottoman Empire
|
Nov 5, 1914
|
France
|
Ottoman Empire
|
Nov 11, 1914
|
Ottoman Empire
|
Russia
|
Nov 11, 1914
|
Ottoman Empire
|
Japan
|
Nov 11, 1914
|
Ottoman Empire
|
United Kingdom
|
May 23, 1915
|
Italy
|
Austria Hungary
|
Jun 3, 1915
|
San Marino
|
Austria Hungary
|
Aug 21, 1915
|
Italy
|
Ottoman Empire
|
Aug 28, 1915
|
Italy
|
Germany
|
Oct 14, 1915
|
Bulgaria
|
Serbia
|
Oct 15, 1915
|
United Kingdom
|
Bulgaria
|
Oct 15, 1915
|
Japan
|
Bulgaria
|
Oct 16, 1915
|
Montenegro
|
Bulgaria
|
Oct 16, 1915
|
France
|
Bulgaria
|
|
Date
|
Initiator Country
|
Targeted Country
|
Oct 19, 1915
|
Russia
|
Bulgaria
|
Oct 19, 1915
|
Italy
|
Bulgaria
|
Mar 9, 1916
|
Germany
|
Portugal
|
Mar 15, 1916
|
Austria Hungary
|
Portugal
|
Aug 27, 1916
|
Italy
|
Germany
|
Aug 27, 1916
|
Romania
|
Austria Hungary
|
Aug 28, 1916
|
Germany
|
Romania
|
Aug 30, 1916
|
Ottoman Empire
|
Romania
|
Sept 1, 1916
|
Bulgaria
|
Romania
|
Apr 6, 1917
|
United States
|
Germany
|
Apr 7, 1917
|
Panama
|
Germany
|
Apr 7, 1917
|
Cuba
|
Germany
|
Jun 27, 1917
|
Greece
|
Austria Hungary
|
Jun 27, 1917
|
Greece
|
Bulgaria
|
Jun 27, 1917
|
Greece
|
Ottoman Empire
|
Jun 27, 1917
|
Greece
|
Germany
|
Jul 22, 1917
|
Thailand
|
Austria Hungary
|
Jul 22, 1917
|
Thailand
|
Germany
|
Aug 4, 1917
|
Liberia
|
Germany
|
Aug 14,1917
|
China
|
Austria Hungary
|
Aug 14,1917
|
China
|
Germany
|
Oct 24, 1917
|
Brazil
|
Germany
|
Dec 7, 1917
|
United States
|
Austria Hungary
|
Dec 10, 1917
|
Panama
|
Austria Hungary
|
Apr 23, 1918
|
Guatemala
|
Germany
|
May 6, 1918
|
Nicaragua
|
Germany
|
May 6, 1918
|
Nicaragua
|
Austria Hungary
|
May 23, 1918
|
Costa Rica
|
Germany
|
Jul 12, 1918
|
Haiti
|
Germany
|
Jul 19, 1918
|
Honduras
|
Germany
|
|