The <a class="mw-redirect" href="https://en.wikipedia.org/wiki/173rd_Airborne" id="mwAQk" rel="mw:WikiLink" title="173rd Airborne">173rd Airborne</a> is ambushed by over 1,200 <a href="https://en.wikipedia.org/wiki/Viet_Cong" id="mwAQo" rel="mw:WikiLink" title="Viet Cong">Viet Cong</a> in <a href="https://en.wikipedia.org/wiki/Operation_Hump" id="mwAQs" rel="mw:WikiLink" title="Operation Hump">Operation Hump</a> during the <a href="https://en.wikipedia.org/wiki/Vietnam_War" id="mwAQw" rel="mw:WikiLink" title="Vietnam War">Vietnam War</a>, while the <a href="https://en.wikipedia.org/wiki/1st_Battalion,_Royal_Australian_Regiment" id="mwAQ0" rel="mw:WikiLink" title="1st Battalion, Royal Australian Regiment">1st Battalion, Royal Australian Regiment</a> fight one of the first set-piece engagements of the war between Australian forces and the Viet Cong at the <a href="https://en.wikipedia.org/wiki/Battle_of_Gang_Toi" id="mwAQ4" rel="mw:WikiLink" title="Battle of Gang Toi">Battle of Gang Toi</a>.