Points of Conflict #3 -- The Roadside Keep -- presents an abandoned keep near a crossroads that has been taken over by bandits.
It is available for free download from:
http://roger.carbol.com/rpg/4e/poc/poc.htm
Points of Conflict is a series of complete, self-contained, ready-to-run encounters that a DM can drop into any adventure. They are designed to be easy to use as improvisational aids and random encounters.
Cheers,
Roger