A word of warning: I captured the Vandal settlement with an army of 4 Men at Arms. Seeing the "Enter Settlement" button appear, I got curious. My troops promptly entered the settlement...never to be seen again. They are listed as building occupants when I hover over the Vandal settlement. They are not, however, listed in my clans screen and I could find no way to get them to exit the settlement. And to add insult to injury, the next turn it reverted back to Vandal control, so it didn't even stay captured. So now I have 4 ghost clans eating my food and taking up my pop cap, but doing nothing else.