I imagine this quest to be something like this: You would follow the caravan for some time on the world map. In the night a caravan guard would ride towards you and start a conversation. He would would say that the caravan master offers you to eat with him at the next resting place. If you accept, you will go to a camp-scene were you can see the caravan and the caravan people and a fire-place where people are cooking. You can then walk around and talk with the caravan people and the caravan guards and the caravan master. Some will give you information, some will give you quests and some will trade small items with you or offer healing or offer to serve you as a soldier after the caravan quest. After some time (5 or 10 minutes) there will be a 30% chance that a caravan guard will shout:"Bandits are attacking!" and now you have 30 seconds to prepare for a battle with attacking bandits. Your goal is to protect the caravan goods and wagons and the caravan people and their animals. You can only command your own soldiers, unless you are a lord, then you can also command the caravan guards. If more than 50 % of the caravan people and their propery is distroyed then you will loose the caravan quest. This quest could be used two times: one time for the player as a protector of the caravan, and a second time as a bandit trying to ambush the caravan. These types of "protect quests" could also be used for farmers, Taverns, lords and kings. Imagine a group of bandits ambushing the tavern while you are inside.