How do you get the 3rd treasure clue for fable the lost chapters

"Given after killing the final assassin at Hook Coast. You must first kill the previous assassins, sent in revenge of Twinblade (The attacks occur outside Knothole Glade, middle of Prison Path, Witchwood Cullis Gate near focus stone site, and the windmill on Windmill Hill)" taken from guides.IGN.com
The pan itself is inOrchard farm but does no damage unless you get all three treasure clues.