Well as I see it, should we do what the AI did, and spend everything we have on recruiting troops and mercs and reuniting the peninsula while making Osca dispensable? I.e. we allow Osca to be lost to the Julii while we reunite the peninsula, then try to engage them in a sally battle or something by sieging Osca back with one unit and 19 others as reinforcements or something...

Does that make any sense to you? I mean, Osca's rich, but that's better than spreading out your forces against a force that has an equal chance of beating you as you have of beating it...