World War I: The <a href="https://en.wikipedia.org/wiki/Battle_of_Halen" id="mwlQ" rel="mw:WikiLink" title="Battle of Halen">Battle of Halen</a> a.k.a. Battle of the Silver Helmets a clash between large Belgian and German <a href="https://en.wikipedia.org/wiki/Cavalry" id="mwlg" rel="mw:WikiLink" title="Cavalry">cavalry</a> formations at <a href="https://en.wikipedia.org/wiki/Halen" id="mwlw" rel="mw:WikiLink" title="Halen">Halen</a>, Belgium.