
Originally Posted by
BailianSteel
I've seen something like this before, mostly in 2.2b, but also concerning Alalia. When a faction would be reduced to just Rhodos in 2.2b (I've seen Koinon and Pergamon in this state,) it would turtle and produce an absurd number of armies on it, literally covering the puny island with soldiers. Inevitably some of these soldiers rebelled, and it took some time for that faction to clear the rebels out.
In my most recent playthrough as Qarth Hadast, I lost Corsim rather quickly to the Romani. In time they lost it to rebellion. At one point the Romani landed a force to try and reclaim Corsim, but engaged in war with the Gauls, so they had a standoff. Eventually the Romani backed down and sent this force elsewhere.
In both cases I mostly stood by and watched, and in your shoes I would do the same here. Corsica is not an amazingly valuable province, if I were to bother with it I would use it as a stepping stone or an extra security measure for the more valuable Sardinia (I might also eliminate it to prevent the possibility of the Carthaginians making Corsica their capital.) If I was inclined to intervene, my plan would be to put a general with Night Attack capabilities in to try and take out one of the Corsican stacks. That might even the odds enough for the Qarthadastim to finish it (once you extricate your force, of course,) though I wouldn't put much stock in that happening. There are two big risks with this plan aside from the stalemate still being in place. One is that the Corsicans or Qarthadastim might simply turn on your force if it's weakened enough. The other is that the Corsicans might have Night Attack capabilities of their own, rendering the plan moot.