This page offers a guide on where to locate and how to complete The Last Raid, which is a Mystery located in Oxenefordscire, Assassin’s Creed Valhalla.
Help the Old Raider
The Raider can be found near his boat, behind the house that’s located west of Evinghou Tower. When you speak to him he will talk about his raiding crew, though as you’ll come to discover, he doesn’t actually have one. You’ll need to help him with the chores nearby. You’ll need to heave the stones, trim the wooden planks and then tidy up the hay stack. After doing all of those chores, the Raider will ask you to blow your horn, which you can do by holding ‘J’.
Once you’ve blown your horn, a pack of wolves will attack will appear and you’ll need to help the man fend them off. There’s only a few wolves so it won’t take long to take care of them. Speak to the Raider again to complete the Mystery.