The 7th and 10th US cavalry regiments under <a href="https://en.wikipedia.org/wiki/John_J._Pershing" id="mwbQ" rel="mw:WikiLink" title="John J. Pershing">John J. Pershing</a> cross the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/US–Mexico_border" id="mwbg" rel="mw:WikiLink" title="US–Mexico border">US–Mexico border</a> to join the hunt for <a href="https://en.wikipedia.org/wiki/Pancho_Villa" id="mwbw" rel="mw:WikiLink" title="Pancho Villa">Pancho Villa</a>.