Caravan Attack is the official name for an unmarked secondary quest in The Witcher 3: Wild Hunt.
The 
rewarded in this quest is unaffected by level and difficulty level constraints.
Walkthrough
Locate the caravan heading along the dirt pathways near the ponds, northwest of Marauders' Bridge. An easy way to find it is by sticking to the path between this bridge and the abandoned site further west. Sounds of commotion from up ahead will prompt you to interject in a fight between two merchants and a group of five bandits.
Slay the men fighting the merchants then speak to the pair, Anselm and Griswold, to learn their hiring methods are somewhat lacking. Despite their impoverished state, Anselm gives a reward of 25 + 20 
, concluding the quest. A week later, he will arrive at Crow's Perch, making Anselm a merchant in the village that you can sell and buy goods with.
However, it is also possible that both merchants die, though very unlikely as they're quite resilient. If that happens, there is still a reward for killing the bandits. After they're finished off, a chest on the merchants' wagon will be filled with 20 , 5 deer hides, 5 bear hides, 5 spools of thread, and a stack of 4 cured leathers, plus the merchants' bodies can be looted as well - no , but a lot more coin value.
Journal entry
- This quest has no journal entry.
Objectives
- This quest has no journal objectives.
Notes
- A notice for this quest exists in the game files, but has been cut and doesn't appear during gameplay.
- Some optional dialogue during the cutscene after the rescue has also been removed. With it, Geralt could say that the guards likely decided they weren't being paid enough, but Anselm would retort that he even paid them more than they were worth, because of rumors about ghouls and other monsters on the road.
- It is technically possible for Anselm to die, while Griswold survives, but this is yet untested and with an unknown outcome.
Bugs
- In the event that Griswold dies, he still appears alongside Anselm in the following cutscene. Immediately after, even his corpse can be looted, yet later dialogue at Crow's Perch still mentions the pair as being rescued together.