700 XP, Torch Mod
After doing the Knocking On Heaven's Door side quest for James, talk to him again to begin this quest. You need to finish the help sign out in the clearing.
There's going to be a bunch of zombies as well as a Thug zombie. Clear all the easy ones first, then take out the Thug. Then all you need to do is finish the "P" with the crates that are lying around. When you finish, go back and talk to James.