Mass combat and formation fighting, ho!
Okay, with that out of the way, my rationale for picking this choice is that my intention is to hunker down, build fortifications, and man them to secure the settlements we still have and our supply lines, while the Cateyes do their spec ops stuff (it's guerrilla warfare, the 'little war' in Spanish, not gorilla which is an animal. It kills me in the inside whenever the latter is used).
And then, we'll wait until we've got a big enough concentration of troops that are drilled enough to take the field and not be cannonfodder, or some other opportunity presents itself. We are on the defending side, and I don't think that the boarfolk can interdict our naval routes, so we may be able to win via exhaustion. This might stretch our naval transport capacity to the limit though.
I'm seeing the option not so much as getting a random farmer and telling them to go fight with minimal training. Rather, I'm seeing it as a way to start getting drill and training masters to train large bodies of warriors and then keeping the institutional knowledge when we demobilise. Also, it may be a start to a burgeoning armaments industry. (Military-Industrial complex, ho!)