On this page of the Assassin's Creed Valhalla game guide, you will find a detailed walkthrough description of the quest The Ignominious Bandit.
Rewards: 1,200 XP.
In the place marked in the above picture, just by the road, you will meet a man calling for help.
When you speak with him, you will find out that it was simply an ambush. After a short while, a squad of bandits will rush at you. Deal with all the enemies and the task will be completed.