There are a couple of Kylerean Harkyn's Sorcerous Familiars in Fort Brush. Fortunately, your men are well-trained soldiers and ambush the facets, who are down before they know what's happening.
No-one is really watching Fort Brush, which becomes very apparent when two professional-looking Flembic chaps show up and inform everyone that Bacci of the Azure Collective owns the place now. Relieved that it isn't giant snake monsters or enormous demonic armies, no-one puts up much of a fight.
Your Sorcerous Familiars don't report in; someone took them out quietly and competently, and the area appears to belong to the Azure Collective now.