World War I: Beginning of the <a href="https://en.wikipedia.org/wiki/Battle_of_Cer" id="mwATM" rel="mw:WikiLink" title="Battle of Cer">Battle of Cer</a>, the first <a href="https://en.wikipedia.org/wiki/Allies_of_World_War_I" id="mwATQ" rel="mw:WikiLink" title="Allies of World War I">Allied</a> victory of World War I.