While playing the game and testing stuff in Custom Battles. I noticed that some Germanic shield wall and maybe even some Gaulish are op or even broken. Currently with Kimbroz you can buy a medium in stats Shield Wall spear unit that has decent stats 300 men and a shield wall that look bad but its unbeatable FROM ALL SIDES. It even flow around battle formantions without having its morale dropped and flanking enemy units. One the other hand roman and greek shield walls seem do not work that way and once flanked they will brake.