Quote Originally Posted by Krusader
Zed is correct, in that the units you can yourself recruit will join you, and the other units will be disbanded.
You also get to keep the general (but not captains), but he gets reequipped with the bodyguard of your faction. I've read that there is a slight bug in that you don't get any other (non-General) family members that may be in the bribed stack, but I've never had that situation.

Quote Originally Posted by Krusader
As to mercenary Elephants they should be in the Carthage-area.
You also can get them in Assyria, Syria, Babylonia, Coele Syria, Phoenicia, and Judaea. But that's a separate pool to the North African one, and so has its own appearance/replenishment rates.