<a href="https://en.wikipedia.org/wiki/World_War_I" id="mwfg" rel="mw:WikiLink" title="World War I">World War I</a>: The first phase of the <a href="https://en.wikipedia.org/wiki/German_spring_offensive" id="mwfw" rel="mw:WikiLink" title="German spring offensive">German spring offensive</a>, <a href="https://en.wikipedia.org/wiki/Operation_Michael" id="mwgA" rel="mw:WikiLink" title="Operation Michael">Operation Michael</a>, begins.