Sorry to go back on a question about gameplay, tried to search the thread, but could not find anything.
I tried to do the "don't really align with anybody" path, so I cannot use the captains, but I already got to the point when I am allowed to raid the raiders

, but I got only three forces (catgirls, Sabia's own, and Kulgan), and it seems I really need four to get it done.
Is there a way to get the fourth force, or should I go back to an earlier point, and effectively ally with one of the captains, so I get his force as well ?