So I'm running a low-magic (read: low-wealth) game. The 4th level PCs have managed to make a few enemies, one of which is going to send some people after them to "detain" them (not necessarily kill them). The enemy knows the PCs have spellcasters, and so will want to be able to deal with that.
Any thoughts on tactics? I'm thinking a small group of thugs (rogues and fighters) and maybe one counterspelling caster ("I have a wizard too!"). But any other ideas that could make for an interesting encounter?