In <a href="https://en.wikipedia.org/wiki/Montana" id="mwig" rel="mw:WikiLink" title="Montana">Montana</a>, U.S. cavalrymen kill 173 <a href="https://en.wikipedia.org/wiki/Native_Americans_in_the_United_States" id="mwiw" rel="mw:WikiLink" title="Native Americans in the United States">Native Americans</a>, mostly women and children, in what becomes known as the <a href="https://en.wikipedia.org/wiki/Marias_Massacre" id="mwjA" rel="mw:WikiLink" title="Marias Massacre">Marias Massacre</a>.