How do I get blood slaves back in my pocket?

[Soyweiser]

This actually makes a lot of blood mages even more awesome. Just script them to cast the spells you want, and have the other commanders ferry in the slaves. If you can guess which province your enemy will attack, this allows you to trade provinces for casting life for a life spells. Script mages to life for a life/retreat (in cbm, a b2 mage with 2 slaves can cast it). And most SC's think twice about attacking you.