August 6 1914 -
Serbia declares war on Germany and
Austria-Hungary declares war
on Russia. So Russia agreed to join Serbia if
Austria-Hungary attacked.
Austria-Hungary had a
military alliance with Germany.
An alliance is an agreement to act together. When Austria-Hungary declared war in
July 1914, Germany joined the
fight against Serbia. (4 ago 1914 ano – 4 ago 1914 ano)