After a last gasp 16-15 victory over Thomond in Limerick last time out, Keith Hayes' side were always playing catch-up against Armagh in their Division 2B clash at New Ormond Park.
But, losing by 18-13, a break from the half-way line at the very end of the game saw the league leaders get over for a try to level the match at 18-18.
Dan Fogarty kicked a successful conversion from the sideline on full time to secure what was Nenagh Ormond's first ever win over Armagh.
However, Cashel RFC went down by 11-6 at home to Old Wesley in Division 2A.
