Actually, the Xeno case would be more like (if we completely mess around with historical coherence and order) the French Resistance attacking the Nazis in Poland. The Xenos aren't an army. Vanillia stated they were falling apart back then. From this, it appears they're only just about keeping it together, but only because the Rogues are afraid of catching their rabies(?).
Why would they attack a full-on military in a House that doesn't matter to them? They'd make no overall impact on the war (Bretonia has 70,000 snub fighters, and 20,000 snub fighters in the civilian militia according to the Bretonian copy of this same thread). How would a few dozen Xenos make any difference at all?
Also, the Lane Hackers are migrating to Kusari, because Bretonia's economy is run down? What happened to Liberty putting massive trade incentives into getting supplies out there for Liberty corporations? I mean, in the overview, it was even stated that Bretonia is Liberty's prime trade partner over Kusari. How can the Lane Hackers not be turning a profit?