The Battle of Ethemisa ( I hope I wrote the name correctly lol) was the one for me. I won with an army of 62 with more than half of my army being imperial cataphracts, up against 400 ish army of (I forgot what empire controls Ethemisa). They stood no chance against those 40 ish cataphracts and eventually lost the Battle with me losing 80% of my 62 men.