On 23 May 1915.
Austria-Hungary
do you know when Britain declared war on Germany and austria-Hungary
Austria-Hungary on Serbia.
Austria-Hungary.
Serbia
The 1st country to declare war on Serbia was Austria-Hungary.
28 July 1914 - Austria-Hungary declares war on Serbia 6 August 1914 - Austria-Hungary declares war on Russia 23 Maj 1915 - Italy declares war on Austria-Hungary
Austria-Hungary fought in the Battle of Ginghames during World War One. This battle was between Austria-Hungary and Italy.
Austria-Hungary
they promised to support Austria-Hungary after it threatened to invade Serbia
they promised to support Austria-Hungary after it threatened to invade Serbia