(from the article `Macbeth`) ...army, near Dunkeld (in the modern region of Perth and Kinross), may account for the later references (in Shakespeare and others) to Birnam Wood, ... ...Harrying caused by political disturbances or by incursions of the Scots or Welsh was only occasional and localized; friendly relations were ... [2 rela... Found on http://www.britannica.com/eb/a-z/s/103