This is the sort of thing that makes me wish Imperial Armour would do a Sororitas-focused book at some point. Did they liberate 100 worlds through a single strike at the Tyrant of Denescura, whose pocket empire fell apart after Saint Aspira and her brave 1,000 slew him? Did they literally conquer 100 worlds (and if so, against what sort of opposition)? Even granting that this is supposed to be one of the high points of the Bloody Rose's history and that their opposition may have been little better than street rabble, it's almost unbelievable to imagine that 1,000 women could literally fight and win 100 sequential battles, so presumably the true story is somewhat more complicated than that - but we don't get to know.
One thing I note we do know is that the liberation of Denescura is called a "War of Faith." So apparently Wars of Faith can be very small in nature - at least as small as 1,000 sisters.
This is certainly the impression I get as well, which actually raises some very interesting questions. Since the Sororitas do not have their own fleets, how are these detachments supplied? We have, to my knowledge, no mention of Sororitas logistical vehicles. Surely they must have some manner of resupplying their sistren in the field (if nothing else, we know that bolt weapons are very low endurance weapons, and given the size and weight of their ammunition, keeping a bolt-equipped unit supplied with ammo must be a non-trivial task). Do they always rely on other arms of the service for logistical support?
Surprisingly, this is untrue. The Immolator's fluff stats are in line with a Razorback's, but it has a slightly lower profile, a slightly slower off-road speed (by 5 kph), and slightly heavier armor (an extra 10mm of armor on the turret). It is also half a ton lighter than the Razorback, which suggests that there's no material difference in the armor technology, either, so an Immolator actually seems to be very slightly tougher than a Razorback. The Exorcist is the real shocker, though. Compared to a Predator, an Exorcist 23% more superstructure armor and 82% more hull armor (54% more hull armor than even a Vindicator). It's also a lot slower - 55/35 kph as opposed to 68/50 kph. And it has a lot less battlefield endurance (48 missiles as opposed to 120 autocannon or unlimited lascannon rounds). Oh, and the Exorcist is twelve tons lighter than a Predator.
The Exorcist has always confused me. It's never been clear to me whether, fluff-wise, it's supposed to be a rocket artillery vehicle a la the MRLS, or whether it's supposed to be a direct-fire missile carrier. If the latter, then its far superior armor compared to a Predator or Vindicator suggests that, in some senses at least, Sisters are better equipped for frontal attacks than are marines.
These facts make me wonder whether the Sisters are, in a sense, more like marines (or whatever your national equivalent of the USMC is) than are space marines (who are better analogized to, say, Army Rangers, or whatever your national [url=http://en.wikipedia.org/wiki/Direct_action_%28military%29]direct action[/url] specialists are). Nobody ever says as much, but I think we must conclude that sisters are an infantry-focused force - their lack of a main battle tank pretty much requires that. Yet compared to marines sisters have several features which imply to me that they don't shy away from conventional engagements as much as marines do. The Exorcist is one. The fact that sisters are more numerous and not as institutionally afraid of death (and thus better able to absorb casualties) is another. And then there's their personal weaponry, which is clearly designed for brutal short-range firefights.
And then there's the mobility issue. Clearly a canoness who as willing to leave her Exorcists behind could match space marines for ground-based speed. But she lacks a Thunderhawk or Valkyrie equivalent to give her force air mobility, and doesn't have access to dedicated assault starships like marines do. Thus, a mechanized Sororitas force lacks the mobility that a mechanized space marine force could have. What about drop pods, though? I know there's some fluff out there somewhere regarding Sororitas and drop pods.
I actually come to the opposite conclusion. A defending force with short-range weaponry is at the mercy of an attacker unless the attacker is spectacularly poorly prepared. The attacker can bring up whatever long-range weaponry he wants, and the defender will have no choice but to either accept an indefinite period of shelling or leave her prepared positions to bring the long-range guns under threat. Either response is advantageous to the attacker. The short range and seemingly low endurance of sisters units (as another example, a heavy flamer armed Immolator only carries enough fuel for 20 bursts - compare to the 98 shots a Hellhound carries) suggests to me that they are essentially assault troops, intended for short, fierce offensive engagements that rely heavily on shock.
This I agree with, for the above reasons.
To an extent I agree ... it doesn't seem that Sororitas doctrine is as codified as that of some space marine chapters. On the other hand, they clearly accept some significant restrictions that one would think fits with their battlefield role - for instance, they never seem to use plasma guns, though you would think that plasma guns are a natural complement to meltas.
As for this novel, that is a subject I am keenly interested in. What sorts of operations do we see the Sororitas conducting in Faith and Fire?