So apparently rebels are considered subjects of their enemy empire, and when they rebel they're at war with their masters but they're still technically servants to their masters. There's a massive slave rebellion in an empire I've been eyeing deviously, and I took advantage of it and declared war. Problem: It made me declare war on the rebel slaves, and I can't take my war goals without fighting them too.
So much for taking advantage of the slaves.
So much for taking advantage of the slaves.