(Conclusions are for skirmish/siege)
I'm forced to draw comparisons to a very similar class: the Aserai skirmisher
With comparable base stats to the Aserai T1 infantry, it becomes rather quickly apparent there are a few fatal flaws this class has.
The lack of shield without a perk is a rather major drawback, and with the lack of a bonus armor perk as well it seems like the class is stuck into a 'jack of all trades' role that it preforms poorly at. Paper thin armor means vulnerability to archers, but you lose the ability to deal with mainline threats if you take the (small) shield.
Unlike the Sturgia and Battania T1I's, they can't be converted into 'board and sword' frontline infantry either; their weak shield and paper armor mixing with a below-average base sword to turn them into fodder. But wait, you may say, they have a throwing weapon! Yes, the basic javs. When upgraded to imperial javelins they do serve as a useful polearm secondary. Again however I am forced to compare to skirmisher.Their 6 jarids outmatch the 4 imperial.
Potential solution:
Rather straightforward, for an auxiliary meant to stay out of combat, the shield is mandatory to prevent counterfire.The shield is made standard, giving them a good bit of survivability. Replacing the shield perk with a 'better shield' or '+9 armor' would also give them the ability to take a more frontline role like the other faction's T1I's