Roman Quarry Camp (Location)
An enemy camp in the Green Mountains. You'll pass through during the Taking Liberty side quest.
The captain and treasure are both toward the middle of this camp, the latter tucked away in the captain's tent.
Approach the tent from the northeast, to bypass the barricade around it.
If the captain is in the tent, drop down and attack from the front door or the backflap- whichever way he isn't facing.
When he's dead, loot the red chest in the corner for your treasure.
This completes the location
If like, you can also drop down to the lower level and free the prisoners before you leave.
Note that there may be bandits mixed among them, who will be as hostile to you and the civilians as they are to the guards. Consider immediate assassination of these killers.