» Sun Sep 02, 2012 11:54 pm
It's a random event. I was attacked by them once on my way to Whiterun for the first time, while I was level 2. I didn't survive the encounter.
Other times, they have attacked the same character several times, and had the same note each time. I dropped one of the notes in Elenwen's chair at the Peace Council at High Hrothgar, just to be an annoyance. Nobody noticed or cared, of course, but it made me happy.