I faced a battle, as KH, that pitted two full stack armies of Epirotes against my one full stack. I didn't expect the 2nd stack to arrive for the battle as reinforcements, but lo and behold, they arrived and I was totally surrounded. Luckily the reinforcement army was most skirmishers, so my small contingent of Hippeis destroyed most of them while my hoplites, especially my spartans and general held off the phalanxes of the main epirote force. The end result was roughly 3000 dead epirotes, to my 250 dead. (large settings btw) Needless to say, I got my first heroic victory that day and their back was was broken. The only reason they exist today, with one city, is because I want them as a buffer against the Romani.