<a href="https://en.wikipedia.org/wiki/World_War_I" id="mwvA" rel="mw:WikiLink" title="World War I">World War I</a>: The <a href="https://en.wikipedia.org/wiki/First_Battle_of_the_Aisne" id="mwvQ" rel="mw:WikiLink" title="First Battle of the Aisne">Battle of Aisne</a> begins between Germany and France.