Sisters Repentia charge fearlessly into melee with a daemonic engine of Khorne. Fully kitted out these squads pack a hefty wallop.
In another corner we see a small defensive line of turrets and walls guarding against enemy attacks.
Here we have an overview of the battle on the central platform. You always know when the Sisters of Battle are present.
What with all the flames in the way, you probably didn't notice that there was a daemon prince of Khorne in the battle with the Repentia as well. He looks very happy.
A Venerable Dreadnaught of the Space Marine chapter "Rainbow Warriors" helps to deal with the daemons.
A charge of Psykers against some mutilators. The one with the sword is the Primaris Psyker who can spawn all the others as a retinue.
Checking a little later we find guardsmen running from a Khorne engine of slaughter and no psykers in sight.
The Repentia continue to carve through daemons amidst flame and explosions.
A while later after many, many nukes and warp storms and we see the amassed army of Sisters fighting against the remaining chaos space marine forces. The Daemons were defeated some time before this shot, having their base destroyed behind their armies.
The Sisters become really powerful later on. Those yellow bubbles mean that unit is invincible. Caused by the Archangle, all units near it become invincible.
Moving on to the traitor guardmen base, the Archangle, fully upgraded, duels with a Reaver titan that the A.I always builds but gets stuck behind their bases buildings.
Victory to the good guys! The abilities and upgrades the sisters get late game really help their otherwise squishy infantry. They have Space Marine grade weapons but only slightly better than guardsmen survivability. Rebuilding units gets very tiring as they also require a lot of unit additions like missionaries and cherebiums to work as best as possible.