I'm still experimenting on how to make Kaisala EA sacred "usable" : with 1 (!!) prot it's not that obvious, plus the fact that the archers don't benefit from the Fire blessing (it only affects melee weapons...).
So currently the only idea I have is to have F9-blessed Yavanas made survivable by Protection (from Guru), Body Eth (Yogi), then Iron Warriors (Yaksha).
Not very effective, nor very fast, and difficult to properly succeed as you rely on AoE1 buffs ...
And even then they can be easily slaughtered by any sustained archer fire ...
As for Yavanas archers they are just overpriced longbowmen with very good precision but no armor, I think I'd rather field 4 Atavis Archers vs 1 Yavana for the same cost.
As Kaisala has no easy access to Wind Guide and more importantly to Flaming Arrows I don't think you can rely on archer strategies.
Do I miss stg ?