DISCLAIMER: Your Steps and Tasks may be different
Speak to Guard Cynon in West Downs and he will ask you to help Guard Dafydd at the guard tower just outside Camp Forest. Dafydd tells you about several bandit prisoners who escaped from custody. He asks you to find the bandits and slay them, returning with proof.
The bandits are almost due east of the guard tower, over the first hill. The bandit leader will have a cloak which you return to Dafydd at the tower.
For anybody who may be having difficulty finding them, the escaped bandits are just south of the first druid ring you run into if you head due east from the tower where Guard Dafydd stands. Look around at loc 26000, 57000 and you should see them walking up and down the hillside south of that druid ring.
Guard Dafydd is the "merchant guard" that many of us sell our loot to when hunting in the southern portions of the plains.
By the way, these bandits drop a lot of loot -- gems, some armor, and other things of decent value as well. They respawn very quickly, and a small group or skillful soloer could do fairly well hunting them.
The reward was experience and almost 24 silver.