In the culmination of the <a href="https://en.wikipedia.org/wiki/July_Crisis" id="mwhQ" rel="mw:WikiLink" title="July Crisis">July Crisis</a>, <a href="https://en.wikipedia.org/wiki/Austria-Hungary" id="mwhg" rel="mw:WikiLink" title="Austria-Hungary">Austria-Hungary</a> declares war on <a href="https://en.wikipedia.org/wiki/Serbia" id="mwhw" rel="mw:WikiLink" title="Serbia">Serbia</a>, igniting <a href="https://en.wikipedia.org/wiki/World_War_I" id="mwiA" rel="mw:WikiLink" title="World War I">World War I</a>.