This is one of the additional quests you can do during Yule Festival if you have a Cattle Farm building in your settlement.
The cows that were meant to be slaughtered for the feast have escaped.
Cow Catcher
Quest stages of Cow Catcher
1. Talk to Winfrith
Head to the cattle farm and talk to Winfrith and her son Bertham just outside the building. You will be tasked to find the cows that have gone missing.
2. Reach the Shore
Go to the docks, jump onto the boat...
...and sail it to the other side of the river.
3. Hunt the missing cattle with Bertham
When you go ashore, three markers will appear on the map.
Go there and search for cows which are moving around. Kill the cows and loot the meat.
After collecting the meat from these three cows a new marker will pop up on the map. Go there and approach the cow. This time, Bertham will kill the cow.
4. Escort Bertham back to Winfrith
Head back to the cattle farm in your settlement. You can use a boat or just swim across the river. Then talk to Winfrith. The quest will end and you will receive 140 tokens. "Bertham The Beast Slayer" is now an available opponent in the "Yule Brawl" quest.
