The <a href="https://en.wikipedia.org/wiki/People's_Army_of_Vietnam" id="mw5Q" rel="mw:WikiLink" title="People's Army of Vietnam">North Vietnamese Army</a> establishes <a href="https://en.wikipedia.org/wiki/Group_559" id="mw5g" rel="mw:WikiLink" title="Group 559">Group 559</a>, whose responsibility is to determine how to maintain <a class="mw-redirect" href="https://en.wikipedia.org/wiki/Supply_line" id="mw5w" rel="mw:WikiLink" title="Supply line">supply lines</a> to <a href="https://en.wikipedia.org/wiki/South_Vietnam" id="mw6A" rel="mw:WikiLink" title="South Vietnam">South Vietnam</a>; the resulting route is the <a href="https://en.wikipedia.org/wiki/Ho_Chi_Minh_trail" id="mw6Q" rel="mw:WikiLink" title="Ho Chi Minh trail">Ho Chi Minh trail</a>.