OI is always trying to save their skin... as they know we will march over them, they aligned with Perdan... but with the war already declared against Perdan, I don't care to march there and burn everything. I doubt Perdan will move to help OI while they have plans for a new colony. And if they march, that will be a pleasure to fight them with a good reason now that Caligus surrended... sissies.
Ask Erik for some help and he will move there with the Silver Legion to burn some islanders and enjoy their women.