Deployed alongside Sisters of Battle - up close with the Emperor's Daughters!
Welcome to the Erian sector. It has declared secession from the Imperium - forcing the Erian schism war.
You, whoever you are, are part of a mixed platoon force, which also hosts a few Sisters of Battle who joined voluntarily.
You serve alongside a Sister called Emmalise.
After a particular battle, she comes back to the staging line, apparently pleased with herself by her own prowess.