<a href="https://en.wikipedia.org/wiki/World_War_I" id="mwfA" rel="mw:WikiLink" title="World War I">World War I</a>: The <a href="https://en.wikipedia.org/wiki/Second_Battle_of_Champagne" id="mwfQ" rel="mw:WikiLink" title="Second Battle of Champagne">Second Battle of Champagne</a> begins.