Declarations of War
1914
July 28 Austria-Hungary on Serbia
August 1 Germany on Russia
August 2 German invasion of Luxembourg1
August 3 Germany on France
August 4 German invasion of Belgium*
August 4 Great Britain enters the war*
August 6 Serbia on Germany
August 6 Austria-Hungary on Russia
August 7 Montenegro on Austria-Hungary
August 11 France on Austria-Hungary
August 12 Great Britain on Austria-Hungary
August 12 Montenegro on Germany
August 23 Japan on Germany
August 23 Austria-Hungary on Japan
August 28 Austria-Hungary on Belgium
October 15 Montenegro on Bulgaria
October 29 the …