<a href="https://en.wikipedia.org/wiki/World_War_I" id="mwrA" rel="mw:WikiLink" title="World War I">World War I</a>: <a href="https://en.wikipedia.org/wiki/Kingdom_of_Italy" id="mwrQ" rel="mw:WikiLink" title="Kingdom of Italy">Italy</a> declares war on <a href="https://en.wikipedia.org/wiki/Austria-Hungary" id="mwrg" rel="mw:WikiLink" title="Austria-Hungary">Austria-Hungary</a>, joining the conflict on the side of <a href="https://en.wikipedia.org/wiki/Allies_of_World_War_I" id="mwrw" rel="mw:WikiLink" title="Allies of World War I">the Allies</a>.